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
How many lactiferous ducts open into nipple 
Select and explain. 
A. 0-10, B. 15-20, C. 25-50, D. 50-75
B: 15-20
Answer: B: 15-20 
Explanation: 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