This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Autoimmune Skin Disorders, Subject name: Skin
Drug not causing exanthematous skin eruption - 
Select and explain. 
A. Phenytoin, B. Hydrocortisone, C. Ampicillin, D. Phenylbutazone
B: Hydrocortisone
Answer: B: Hydrocortisone 
Explanation: Ans is 'b' i.e., Hydrocortisone Drugs causing exanthematic reactionsMost commonLess commonAmpicillin and penicillinCephalosporinsPhenylbutazone and other pyrazolonesBarbituratesSulphonamidesThiazidesPhenytoinNaproxenCarbamazepineIsoniazidGoldPhenothiazinesGentamicinQuinidineMeprobamate Atropine