This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Parathyroid and adrenal glands, Subject name: Surgery
Commonest symptom of pheochromocytoma is: 
Select and explain. 
A. Palpitation, B. Headache, C. Sweating, D. Dyspnea
B: Headache
Answer: B: Headache 
Explanation: Classic triad: Headache, Diaphoresis, Palpitations. Most common symptom is headache. MC manifestation is Hypeension.