This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Anatomy
[{'content': 'The action of the anconeus muscle is - \nSelect and explain. \nA. Screwing movements, B. Elbow flexion, C. Forearm supination, D. Adduction', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Action of Anconeus\n-\xa0\xa0\xa0\xa0\xa0\xa0\xa0 Helps triceps in extension of elbow joint.\n-\xa0\xa0\xa0\xa0\xa0\xa0\xa0 Resists abduction of ulna on pronation of forearm.\n-\xa0\xa0\xa0\xa0\xa0\xa0\xa0 Screwing movement\n-\xa0\xa0\xa0\xa0\xa0\xa0\xa0 Elbow joint capsule tensor.', 'role': 'assistant'}]