This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: A.N.S., Subject name: Pharmacology
Action of adranaline is reversed by prazosine but not by propranol 
Select and explain. 
A. Tachycardia, B. Bronchial dilatation, C. Urinary symptoms of BHP, D. Migraine
C: Urinary symptoms of BHP
Answer: C: Urinary symptoms of BHP 
Explanation: i.e. (Urinary symptoms of BHP): (133-KDT 6th)* Prazocine is a1 blocker and propranol is non selective beta blocker* Urinary symptoms in BHP are solely due to alpha receptorsThe a blockers have no effect on adrenergically induced cardiac stimulation, bronchial dilatation, vasodilation and most of the metabolic changes because these are mediated predominantly through b-receptors (133-KDT 6th)