Triple

Given a phrase, classify it is english named entity (e.g., persons, organizations, works of art) in Latin script, or not (e.g., literals, dates, URLs, verbose phrases). For disambiguation, the statement where the phrase occurs as object is also given. Please return a JSON object with `phrase` (string, the phrase being analyzed) and `is_ne` (boolean, indicating whether the phrase is a Named Entity).

Phrase: HK21 machine gun | Statement: [Heckler & Koch, product, HK21 machine gun]

Target entity: HK21 machine gun
Context triple: [Heckler & Koch, product, HK21 machine gun]

• A. MG 131 machine gun
  The MG 131 machine gun was a German 13 mm aircraft-mounted heavy machine gun used extensively by the Luftwaffe during World War II for defensive and offensive armament on various combat aircraft.
• B. MG 81 machine gun
  The MG 81 machine gun was a fast-firing 7.92 mm German aircraft-mounted weapon used extensively by the Luftwaffe during World War II.
• C. 7.62 mm M240 machine gun
  The 7.62 mm M240 machine gun is a belt-fed, gas-operated general-purpose machine gun widely used by U.S. and NATO forces for infantry support and as a mounted weapon on vehicles and aircraft.
• D. Maxim machine gun
  The Maxim machine gun is a pioneering late 19th-century recoil-operated, water-cooled heavy machine gun that became one of the first fully automatic weapons widely adopted by major armies around the world.
• E. M230 30 mm chain gun
  The M230 30 mm chain gun is a single-barrel, electrically driven automatic cannon primarily used on attack helicopters for high-rate, accurate fire against ground targets.
• F. None of above. chosen
• G. Unsure - the case is ambiguous/there is not enough information to decide.

Generate a one-sentence description of the target entity. 
You are given a context triple in the form (subject, predicate, object), where the object is the target entity. 
# Instructions
Use the triple to infer relevant information about the entity. Describe the entity based on what is most defining, well-known. 
Avoid repeating the information from the triple, unless really essential.
# Response Format
Return only the sentence: "Description: [one-sentence description of the target entity]"

Entity: HK21 machine gun
Triple: [Heckler & Koch, product, HK21 machine gun]

The HK21 machine gun is a German-designed, belt-fed general-purpose machine gun developed by Heckler & Koch and based on the G3 rifle’s roller-delayed blowback system.

Target entity: HK21 machine gun
Target entity description: The HK21 machine gun is a German-designed, belt-fed general-purpose machine gun developed by Heckler & Koch and based on the G3 rifle’s roller-delayed blowback system.

• A. MG 131 machine gun
  The MG 131 machine gun was a German 13 mm aircraft-mounted heavy machine gun used extensively by the Luftwaffe during World War II for defensive and offensive armament on various combat aircraft.
• B. MG 81 machine gun
  The MG 81 machine gun was a fast-firing 7.92 mm German aircraft-mounted weapon used extensively by the Luftwaffe during World War II.
• C. 7.62 mm M240 machine gun
  The 7.62 mm M240 machine gun is a belt-fed, gas-operated general-purpose machine gun widely used by U.S. and NATO forces for infantry support and as a mounted weapon on vehicles and aircraft.
• D. Maxim machine gun
  The Maxim machine gun is a pioneering late 19th-century recoil-operated, water-cooled heavy machine gun that became one of the first fully automatic weapons widely adopted by major armies around the world.
• E. M230 30 mm chain gun
  The M230 30 mm chain gun is a single-barrel, electrically driven automatic cannon primarily used on attack helicopters for high-rate, accurate fire against ground targets.
• F. None of above. chosen