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': 'An adult is presenting with severe dandruff and greasy yellow scales on scalp. Diagnosis is – \nSelect and explain. \nA. Seborrheic dermatitis, B. Pityriasis rubra pilaris, C. Pityriasis rosea, D. Lichen planus', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Following clues in this question suggest the diagnosis of seborrheic dermatitis.\n\ti) Severe dandraff\n\tii)\xa0\xa0 Greasy yellow scales\n\tiii) Scalp involvement', 'role': 'assistant'}]