This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pharmacology
All of the following cephalosporins have good activity against Pseudomonas aeruginosa EXCEPT : 
Select and explain. 
A. Cefadroxil, B. Cefepime, C. Cefoperazone, D. Ceftazidime
A: Cefadroxil
Answer: A: Cefadroxil 
Explanation: First generation cephalosporins like cefadroxil are mainly effective against gram +ve organisms and possess little activity against Pseudomonas.