This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Endocrinology, Subject name: Pharmacology
The most potent topical coicosteroid is: 
Select and explain. 
A. Hydrocoison butyrate cream 0.1%, B. Betamethasone Valerate cream 0.1%, C. Clobetasol propionate cream 0.5%, D. Clobetasone butyrate cream 0.5%
B: Betamethasone Valerate cream 0.1%
Answer: B: Betamethasone Valerate cream 0.1% 
Explanation: The most potent topical coicosteroid is betamethasone. It is similar to dexamethasone. used for eczema, dermatitis, allergies, rash (REF.Essential of medical pharmacology K D TRIPATHI 6 Edition - Page No 282)