This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Disorders of Adrenal Gland, Subject name: Medicine
Which is the most common clinical feature of pheochromocytoma? 
Select and explain. 
A. Profuse sweating, B. Palpitations, C. Diarrhea, D. Headaches
D: Headaches
Answer: D: Headaches 
Explanation: The most common clinical feature is headaches due to paroxysmal hypeension. The mnemonic to remember triad for suspecting pheochromocytoma is PHD- Palpitations, Hypeension,Hypercalcemia Diaphoresis. Note: Remember it is a mnemonic and does not imply that most common feature is palpitations.