This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Cardiovascular system, Subject name: Physiology
[{'content': 'Normal pH of human semen \nSelect and explain. \nA. 7, B. 7.2, C. 7.4, D. 7.8', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Normal pH range of semen is: 7.35-7.50Ref: Ganong Review to medical physiology edition. 23 pg No:405', 'role': 'assistant'}]