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: Microbiology
[{'content': 'H. influenza requires the following growth factor: September 2004 \nSelect and explain. \nA. Ammonia, B. Nicotinic acid, C. Glycine, D. Haemin', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ans. D i.e. Haemin', 'role': 'assistant'}]