This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Erythmato-Squamous and Lichenoid Eruption, Subject name: Skin
[{'content': 'Most common cause of erythema multiforme? \nSelect and explain. \nA. Herpes simplex, B. Mycoplasma, C. Varicella zoster, D. Influenza virus', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. a (Herpes simplex). (Ref. Harrison\'s, Principles of Internal Medicine, 16the d., pg 112)ERYTHEMA MULTIFORME# A vesiculobullous disease.# Pink red macules & papules with dusky violet colour or petechiae center which later becomes vesicles is clue to diagnosis (centrifugal spread).# "Target/iris" lesions--characteristic.# Preferred sites--distal extremities, mucous membrane.# Hemorrhagic crusts of lips characteristic (d/d - herpes simplex, pemphigus vulgaris, paraneoplastic pemphigoid)# Lesions resolve in 3-6 weeks', 'role': 'assistant'}]