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: Dental
A 27 year old sexually active male develops a vesiculobullous lesion on the glans soon after taking tablet paracetamol for fever. The lesion healed with hyperpigmentation. The most likely diagnosis is – 
Select and explain. 
A. Behcet's syndrome, B. Herpes genitalis, C. Fixed drug eruption, D. Pemphigus vulgaris
C: Fixed drug eruption
Answer: C: Fixed drug eruption 
Explanation: Presentation with a solitary lesion in the genital skin that heals with hyperpigmentation. Soon after ingestion of paracetamol, one of the most commonly implicated agents for FDE, suggests a diagnosis of Fixed Drug Eruption (FDE)