This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Pregnancy induced Hypeension, Subject name: Gynaecology & Obstetrics
Which of the following is appropriate first-line medical therapy for hypeension with pheochromocytoma in pregnancy? 
Select and explain. 
A. Calcium-channel blockers, B. b -Blockers, C. a-Blockers, D. Apresoline
C: a-Blockers
Answer: C: a-Blockers 
Explanation: Immediate control of hypeension and pheochromocytoma symptoms with an alpha blocker such as phenoxybenzamine is imperative. The dose is 10 to 30 mg, two to four times daily. After alpha-blockade is achieved, beta -blockers may be given for tachycardia if necessary.