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
[{'content': 'What is the normal pH of human blood \nSelect and explain. \nA. 7, B. 7.2, C. 7.35 to 7.4, D. 7.6', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]