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
[{'content': 'At same concentration of steroids which of the following is most potent \nSelect and explain. \nA. Ointment, B. Cream, C. Lotion, D. Gel', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Refer Katzung 11/e p 1048 Ointment bases tend to give Better activity to the coicosteroids than do cream or lotion Ability of the voice to retard evaporation from the surface of skin varies.', 'role': 'assistant'}]