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 not ureidopenicillin? 
Select and explain. 
A. Piperacillin, B. Mezlocillin, C. Azlocillin, D. Flucloxacillin
D: Flucloxacillin
Answer: D: Flucloxacillin 
Explanation: None