This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Skeletal System, Subject name: Radiology
[{'content': 'Number of carpal bones seen in a radiograph of an infant is: \nSelect and explain. \nA. 0, B. 2, C. 3, D. 5', 'role': 'user'}, {'content': 'Answer: B \nExplanation: b) 2 ref: Sutton 7th/e p. 1848 fig A3', 'role': 'assistant'}]