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: Anatomy
[{'content': 'Least mobile metatarsal of foot \nSelect and explain. \nA. 1st metatarsal, B. 2nd metatarsal, C. 3rd metatarsal, D. 4th metatarsal', 'role': 'user'}, {'content': 'Answer: B \nExplanation: 2nd metatarsal is longest and least mobile among all metatarsals, hence more prone for March fracture', 'role': 'assistant'}]