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: Surgery
[{'content': 'The usual site of stress fracture includes \nSelect and explain. \nA. Tibia, B. First metacarpal bone, C. Second metacarpal bone, D. Second metatarsal bone', 'role': 'user'}, {'content': 'Answer: D \nExplanation: D. i.e. Second metatarsal bone', 'role': 'assistant'}]