This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Psoriasis, Subject name: Dental
Most potent topical steroid? 
Select and explain. 
A. Hydrocoisone, B. Betamethasone, C. Clobetasol propionate, D. Clobetasone butyrate
C: Clobetasol propionate
Answer: C: Clobetasol propionate 
Explanation: Classification Of Topical Steroids By Potency 1 Very potent 0.05% Clobetasol propionate 0.3% Diflucoolone valerate 0.1% 2 Potent Betamethasone valerate 0.025% Fluocinolone acetonide 0.025% 3 Diluted potent Betamethasone valerate 0.00625% Fluocinolone acetonide 0.05% 4 Moderately potent Clobetasone butyrate 0.05% Alclometasone dipropionate 2.5% 5 Mild Hydrocoisone 1%