This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Pharmacology
the above condition is due to execessive usage of ? 
Select and explain. 
A. ticeplanin, B. pipericellin, C. VANCOMYCIN, D. metronidazole
C: VANCOMYCIN
Answer: C: VANCOMYCIN 
Explanation: image shows red man syndrome which is a side effect of vancomycin usage which increases histamines and causes flushing of the skin Vancomycin: Red Man Syndrome * Constellation of symptoms : Pruritus, flushing, erythroderma common : Hypotension uncommon * Due to nonspecific histamine release that is rate related (rare repos of IgE-anaphylaxis) * Severity correlates with amount of histamine released into plasma * Severity reduced by reducing rate to < 500 mg/hr and premedication with H1-antagonists ref : kd tripathi 8th ed