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
[{'content': 'A patient presented with scarring alopecia, thinned nails, hypopigmented macular lesions over the trunk and oral mucosa. The diagnosis is – \nSelect and explain. \nA. Psoriasis, B. Leprosy, C. Lichen planus, D. None', 'role': 'user'}, {'content': "Answer: D \nExplanation: Most of the guide have given lichen planus as the answer.\nBut, None of the given option is fully correct.\nPatient in this question is presenting with -\n\n\nScarring alopecia\nThinned nails\nHypopigmented macular lesions\nInvolvement of oral mucosa\n\n\nPsoriasis and pemphigus are out of question as these two don't cause alopecia.\nTwo options left are leprosy and lichen planus, both can cause scarring alopecia\n\ni). Thinned nail and oral mucosal involvement favour lichen planus as diagnosis, but the lesion of Lichen planus\xa0is hyperpigmented, i.e. hyperpigmented violoceous plaques and surrounding hyperpigmented macules.\nii)\xa0\xa0 Hypopigmented macule can occur in leprosy, but nail thinning rule out leprosy.\n\nSo, No options is absolutely correct.\nIf we consider that there was misprinting in the question (i.e. hypopigmentation instead of hyperpigmentation), than you can go ahead with lichen planus.", 'role': 'assistant'}]