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
Normal acid level in stomach is 
Select and explain. 
A. 300-400 m Eq, B. 100-200 m Eq, C. 20-40 m Eq, D. 15-20 m  Eq
C: 20-40 m Eq
Answer: C: 20-40 m Eq 
Explanation: None