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: Skin
Which of the following is the MOST potent topical coicosteroid? 
Select and explain. 
A. Clobetasone, B. Clobetasol, C. Betamethasone, D. Beclomethasone
B: Clobetasol
Answer: B: Clobetasol 
Explanation: The topical coicosteroids are classified based on their potencies mild, moderate, potent and very potent. On their vasoconstrictor potential, clobetasol and halobetasol are super potent while hydrocoisone and clobetasone are least potent. Ref: Rook's textbook of dermatology, Edition-8, Page 73.20.