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: Pathology
[{'content': "Hyperpigmentation is seen in all except \nSelect and explain. \nA. peutz jeghers syndrome, B. addison's disease, C. cushing's sydrome, D. Aright syndrome", 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]