This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Glands & Connective tissue, Subject name: Anatomy
The mammary gland is which type of gland? 
Select and explain. 
A. Apocrine, B. Merocrine, C. Holocrine, D. Endocrine
A: Apocrine
Answer: A: Apocrine 
Explanation: None