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
Which of the following is an anti-pseudomonal drug of penicillin class: March 2013 
Select and explain. 
A. Nafcillin, B. Dicloxacillin, C. Piperacillin, D. Cloxacillin
C: Piperacillin
Answer: C: Piperacillin 
Explanation: Ans. C i.e. Piperacillin Extended-spectrum penicillin It is a group of antibiotics that has the widest antibacterial spectrum of all penicillins. It is also called antipseudomonal penicillins. This group includes the Aminopenicillins: Amoxicillin Ampicillin Epicillin - Carboxypenicillins: Ticarcillin Carbenicillin Ureidopinicillin Azlocillin Mezlocillin Piperacillin - Mecillinam