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
Which of the following enzymes is stable at acidic pH 
Select and explain. 
A. Pepsin, B. Trypsin, C. Chymotrypsin, D. Carboxypeptidase
A: Pepsin
Answer: A: Pepsin 
Explanation: Optimum pH for Pepsin- 1.6-3.2