This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Upper limb, Subject name: Anatomy
[{'content': 'Function of anconeus is \nSelect and explain. \nA. Pronation, B. Supination, C. Flexion, D. Extension', 'role': 'user'}, {'content': 'Answer: D \nExplanation: ANCONEUS:- Origin: back of lateral epicondyle.Inseion:-lateral side of olecranon process. and upper surface of posterior surface of ulna.Nerve supply: nerve to anconeus. (Branch of radial nerve)Action:weak extensor of elbow joint.{Reference: vishram singh, pg no.129}', 'role': 'assistant'}]