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
At same concentration of steroid which of the following is most potent ? 
Select and explain. 
A. Ointment, B. Cream, C. Lotion, D. Gel
A: Ointment
Answer: A: Ointment 
Explanation: None