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: Pharmacology
The most potent topical coicosteroid is ? 
Select and explain. 
A. Betamethasone valerate, B. Triamcinolone acetonide, C. Hydrocoisone acetate, D. Clobetasol propionate
D: Clobetasol propionate
Answer: D: Clobetasol propionate 
Explanation: Ans. is 'd' i.e., Clohetasol propionate