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
At the same concentration of steroid which of the following is most potent? 
Select and explain. 
A. Ointment, B. Lotion, C. cream, D. Gel
A: Ointment
Answer: A: Ointment 
Explanation: The potency of a topical coicosteroid depends on the formulation. Potency is also increased when a formulation is used under occlusive dressing or in interiginous areas. In general, ointments are more potent than creams or lotions.