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': 'The normal mean corpuscular hemoglobin (MCH) is: \nSelect and explain. \nA. 5-8 pg, B. 15-18 pg, C. 28-32 pg, D. 32-38 pg', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]