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: Biochemistry
What is the normal pH of the blood 
Select and explain. 
A. 7.30–7.40, B. 7.35–7.45, C. 7.20–7.30, D. 7.45–7.55
B: 7.35–7.45
Answer: B: 7.35–7.45 
Explanation: Option B: The normal blood pH is tightly regulated between 7.35 and 7.45.