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
H. influenza requires the following growth factor: September 2004 
Select and explain. 
A. Ammonia, B. Nicotinic acid, C. Glycine, D. Haemin
D: Haemin
Answer: D: Haemin 
Explanation: Ans. D i.e. Haemin