This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Orthopaedics
[{'content': 'Tennis elbow is characterized by \nSelect and explain. \nA. Tenderness over the medial epicondyle, B. Tendinits of common extensor origin, C. Tendinitis of common flexor origin, D. Painful flexion and extension', 'role': 'user'}, {'content': "Answer: B \nExplanation: Tennis elbow is extraaicular affection characterized by pain and acute tenderness at the origin of the extensor muscles of the forearm from the lateral epicondyleIt is believed to be caused by strain of the forearm extensor muscles, paicularly the extensor carpi radialisbrevis, at the point of their origin from lateral epicondyle(Refer: Mohindra's Fundamentals of Ohopedics, 2nd edition, pg no. 175, 497)", 'role': 'assistant'}]