This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Dental
[{'content': 'Iris lesion is seen in \nSelect and explain. \nA. Utricaria, B. Scabies, C. Lichen planus, D. Erythema multiformae', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Erythema multiforme(EM) is an acute ,self limiting skin disease charecterised by the abrupt onset of symmetrical target lesions. Erythema multiforme is a skin reaction that can be triggered by an infection or some medicines. The classic lesions are iris or target lesions which are less than 3 cm in diameter, rounded and have 3 zones:central area of dusky erythema, middle paler area of oedema and an outer ring of erythema with well defined margin. Sites: commonly the extremities and the face, but face,trunk ,oral and genital mucosa may be affected. There are two forms: EM major and EM minor. Ref Harrison 20th edition pg 1235, Fitzpatrick 8thednpg 434)', 'role': 'assistant'}]