This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Thorax, Subject name: Anatomy
[{'content': 'How many Lactiferous ducts open in nipple - \nSelect and explain. \nA. 0-10, B. 15-20, C. 25-50, D. 50-75', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., 15-20 o The nipple is pierced by 15-20 lectiferous ducts.", 'role': 'assistant'}]