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': 'Commonest site of march is: \nSelect and explain. \nA. Involves shaft of 2 & 3 rd metatarsals, B. Avulsion of 5th metatarsals, C. Calcaneus involved, D. Olecranon involved', 'role': 'user'}, {'content': 'Answer: A \nExplanation: A i.e. Involves shaft of 2 & 3 rd metatarsals * March fracture is a stress fatigue fracture of second metarsalQ* Avulsion fracture of base of fifth metatarsal is known as pot hole injury or Robe Jones fracture', 'role': 'assistant'}]