This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Injuries to the Leg, Ankle & Foot, Subject name: Orthopaedics
[{'content': 'Most common site of stress fracture - \nSelect and explain. \nA. 2nd metacarpal, B. 2nd metatarsal, C. Fibula, D. Ribs', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., 2nd metatarsal Three most common sites for stress fractures* Second and third metatarsal (most common site)- due to repeated marching in solider.* Fibula (2nd most common) and* Tibia (3rd most common site) - repeated running or dancing.", 'role': 'assistant'}]