This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Cushing Syndrome, Subject name: Medicine
[{'content': 'Which is the most common clinical feature of Cushing syndrome? \nSelect and explain. \nA. Moon facies, B. Purplish skin striae, C. Hypokalemic alkalosis, D. Weight gain', 'role': 'user'}, {'content': 'Answer: D \nExplanation: The most common presentation of Cushing syndrome is Obesity or Weight gain. Clinical features Frequency Weight gain 80% Moon facies 75% Purplish skin striae 65% Hypokalemic alkalosis 15%', 'role': 'assistant'}]