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': 'Which of the following drug is effective against both Pseudomonas and Proteus? \nSelect and explain. \nA. Cloxacillin, B. Amoxicillin, C. Carbenicillin, D. Ampicillin', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Carbenicillin is effective against both proteus and pseudomonas. Cloxacillin is a -penicillinase resistant penicillin. - It is mainly effective against gram positive bacteria paicularly those producing penicillinase. - It is not effective against proteus or pseudomonas. Amoxicillin and ampicillin are wide spectrum penicillins. - These are effective against many gram negative bacteria including proteus. However, these are not effective against Pseudomonas. ANTI-PSEUDOMONAL PENICILLINS C: Carbenicillin T: Ticarcillin M: Mezlocillin A: Azlocillin P: Piperacillin', 'role': 'assistant'}]