This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Anti Microbial, Subject name: Pharmacology
Which of the following drug can cause grey baby syndrome 
Select and explain. 
A. Tetracycline, B. Chloramphenicol, C. Vancomycin, D. Clindamycin
B: Chloramphenicol
Answer: B: Chloramphenicol 
Explanation: Ref: KDT, 6th ed. pg. 717Antimicrobial drugsSide effectsChloramphenicolGrey baby syndrome Bone marrow suppressionTetracyclineTeeth discoloration and bone growth suppressionPhototoxicityFanconi syndrome (in case of expired tetracycline)Vestibular dysfunctionVancomycinRed man/Red neck syndrome Nephrotoxic and ototoxicClindamycinPseudomembranous colitisVANCOMYCIN: drug of choice for MRSA Vancomycin NEVER effective against Pseudomonasb LACTAMS never effective against MRSA.AMINOGLYCOSIDE never effective against Anaerobes.Most common cause of pseudo membranous colitis: 3rd Gen. cephalosporin.DOC for pseudo membranous colitis: VANCOMYCIN (Oral).Preferred agent in mild case of pseudomembranous colitis- Metronidazole