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
Function of anconeus is 
Select and explain. 
A. Pronation, B. Supination, C. Flexion, D. Extension
D: Extension
Answer: D: Extension 
Explanation: 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}