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': 'Abduction of Hand is caused by \nSelect and explain. \nA. FCR, B. FCU, C. FDP, D. FDS', 'role': 'user'}, {'content': 'Answer: A \nExplanation: The flexor carpi radialis muscle originates from the medial epicondlyle of humerus and inses into the bases of 2nd and 3rd metacarpal bones. Its action is abduction of hand at the wrist joint. BD CHAURASIA 7th edition ,page 108 table 9.2', 'role': 'assistant'}]