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
The most serious side-effect of drug chloramphenicol is: 
Select and explain. 
A. Candidiasis, B. Photosensitivity, C. Bone marrow depression, D. Angioneurotic oedema
C: Bone marrow depression
Answer: C: Bone marrow depression 
Explanation: None