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
[{'content': 'What is the normal pH of the blood \nSelect and explain. \nA. 7.30–7.40, B. 7.35–7.45, C. 7.20–7.30, D. 7.45–7.55', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Option B:\xa0The normal blood pH is tightly regulated between 7.35 and 7.45.', 'role': 'assistant'}]