This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Anatomy and physiology of bone and fracture healing, Subject name: Orthopaedics
[{'content': 'What is March fracture? \nSelect and explain. \nA. Fracture of 2nd metatarsal, B. Fracture of 4th metatarsal, C. Fracture of cuboids, D. Fracture of tibia', 'role': 'user'}, {'content': 'Answer: A \nExplanation: March fracture, also known as Insufficiency fracture is a stress or fatigue fractures of the metatarsals paicularly the second metatarsal bone.It is more often seen in military personnel who induge in frequent and prolonged marching. ref: john ebnezar textbook ,page no.288', 'role': 'assistant'}]