Non-steroidal Anti-inflammatories – which is the odd one out?

Non-steroidal Anti-inflammatories – which is the odd one out?.

Non-steroidal Anti-inflammatories – which is the odd one out?
(a)        Diclofenac                    P.N.     ______________________
(b)        Metronidazole              P.N.     ______________________
(c)        Piroxicam                     G.N.    ______________________
(e)               Ibuprofen                     P.N.     ______________________
 
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Non-steroidal Anti-inflammatories – which is the odd one out?