This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Chemotherapy, Subject name: Pharmacology
Carbenicillin 
Select and explain. 
A. Is effectivr in pseudomonas infection, B. Has no effect in Proteus infection, C. Is a macrolide antibiotic, D. Is admistered orally
A: Is effectivr in pseudomonas infection
Answer: A: Is effectivr in pseudomonas infection 
Explanation: Carbenicillin Is a Pencillin congener effective against pseudomonas and indole positive Proteus which are not inhibited by Pencillin G It is inactive orally and excreted rapidly in urine It is sensitive to Pencillinase and acid So admistrmeed parenterally Refer KDT 6/e p702