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': 'Gamekeepers thumb is \nSelect and explain. \nA. Thumb metacarpophalangeal joint ulnar collateral ligament rupture, B. Thumb metacarpophalangeal joint radial collateral ligament rupture, C. Thumb interphalangeal joint ulnar collateral ligament rupture, D. Thumb interphalangeal joint radial collateral ligament rupture', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Injury to the thumb metacarpophalangeal joint ulnar collateral ligament is commonly referred to as gamekeeper thumb or skier\'s thumb, although the original "gamekeeper" description (Campbell, 1955) referred to an attritional ulnar collate-earl ligament injurySnow skiing accidents and falls on an outstretched hand with forceful radial and palmar abduction of the thumb are the usual cases(Refer: Mohindra\'s Fundamentals of Ohopedics, 2nd edition, pg no. 177, 495)', 'role': 'assistant'}]