This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Physiology
Paneth cells secrete which of the following ? 
Select and explain. 
A. Antibacterial substance, B. Lipase, C. Maltase, D. Secretin
A: Antibacterial substance
Answer: A: Antibacterial substance 
Explanation: None