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: Pathology
A 60-year-old has got severe bulla and target lesion which erythema around halo and genital lesions: 
Select and explain. 
A. Stevens Jhonson syndrome, B. Herpes zoster, C. Herpes simplex, D. Herpangina
A: Stevens Jhonson syndrome
Answer: A: Stevens Jhonson syndrome 
Explanation: Stevens — Johnson syndrome is very severe bullous form of erythema multiformae and is characterized by oral, ocular and genital lesions.