This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Cell Wall Synthesis Inhibitors, Subject name: Pharmacology
[{'content': 'Following drugs are antipseudomonal except \nSelect and explain. \nA. Carbenicillin, B. Piperacillin, C. Vancomycin, D. Azlocillin', 'role': 'user'}, {'content': 'Answer: C \nExplanation: VANCOMYCIN Vancomycin is drug which is not effective against Pseudomonas Not effective orally Causes Red man syndrome(vancomycin cause direct action on Mast cells and release histamine) Other toxic effects of vancomycin are chills, ototoxicity and nephrotoxicity. DOC- MRSA, antibiotic associated pseudomembranous enterocolitis.', 'role': 'assistant'}]