This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Physiology
[{'content': 'Episodic hypeension is a feature of \nSelect and explain. \nA. Carcinoid tumor, B. Insulinoma, C. Pheochromocytoma, D. Zollinger-Ellison syndrome', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Classic triad: Headache + Diaphoresis+ Palpitation', 'role': 'assistant'}]