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 into nipple \nSelect and explain. \nA. 0-10, B. 15-20, C. 25-50, D. 50-75', 'role': 'user'}, {'content': "Answer: B \nExplanation: The gland consists of 15 to 20 lobes.Each lobe is a cluster of alveoli,and is drained by a lactiferous duct.The lactiferous ducts converge towards the nipple and open on it.Near it's termination each duct has a dilatation called a lactiferous sinus. Ref.B D Chaurasia's human anatomy.vol.1", 'role': 'assistant'}]