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: Orthopaedics
[{'content': 'Commonest site of march # is - \nSelect and explain. \nA. Involves shaft of 2 & 3rd metatarsals, B. Avulsion # of 5th metatarsals, C. Calcaneus involved, D. Olecranon involved', 'role': 'user'}, {'content': 'Answer: A \nExplanation: March fracture is fatigue (stress) fracture of metatarsals.\nThe fracture usually affects the shaft or neck of the second and third metatarsal bone.', 'role': 'assistant'}]