This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Medicine
A person has headache & profuse sweating. On examination his B.P is 200/120 mm Hg. Which of the following shoud not be used -a) Nifedipineb) Phenoxybenozamine c) Methyldopad)  Labetalol 
Select and explain. 
A. ab, B. abc, C. bc, D. bd
B: abc
Answer: B: abc 
Explanation: None