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
All are true about erythema multiformis except – 
Select and explain. 
A. Due to Herpes simples, B. Due to sulphonamide, C. Lesion are symmetrical, D. Mucous membrane is usually involved
D: Mucous membrane is usually involved
Answer: D: Mucous membrane is usually involved 
Explanation: Mucosal involvement is uncommon (<20%) in erythema multiforme (erythema multiforme minor), where as mucosal involvement is common in TEN-SJS complex.