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: Pharmacology
Gray baby syndrome is caused by : 
Select and explain. 
A. Chlorpromazine, B. Chloramphenicol, C. Phenytoin, D. Gentamycin
B: Chloramphenicol
Answer: B: Chloramphenicol 
Explanation: None