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
An adult is presenting with severe dandruff and greasy yellow scales on scalp. Diagnosis is – 
Select and explain. 
A. Seborrheic dermatitis, B. Pityriasis rubra pilaris, C. Pityriasis rosea, D. Lichen planus
A: Seborrheic dermatitis
Answer: A: Seborrheic dermatitis 
Explanation: Following clues in this question suggest the diagnosis of seborrheic dermatitis.
	i) Severe dandraff
	ii)   Greasy yellow scales
	iii) Scalp involvement