During a routine physical examination, a 35-year-old male is found to have a blood pressure of 170/1

During a routine physical examination, a 35-year-old male is found to have a blood pressure of 170/105 mmHg.History reveals episodes of headache accompanied by palpitations, diaphoresis, and anxiety.A tentative diagnosis of pheochromocytoma（a catecholamine-secreting tumor） is confirmed when blood pressure falls in response to the administration of which of the following

A.An ACE inhibitor

B.A b-adrenergic agonist

C.An a-adrenergic blocker

D.A diuretic

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