This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: NEET 2019, Subject name: Pharmacology
Hypeension and pulmonary edema associated with scorpion sting is managed by :- 
Select and explain. 
A. Carvedilol, B. Prazosin, C. Spironolactone, D. Phentolamine
B: Prazosin
Answer: B: Prazosin 
Explanation: Scorpion sting cause excessive stimulation of alpha 1 receptor. Of the above mentioned drug:- Prazosin acts by blocking alpha 1 receptor. Therefore drug of choice for Scorpion sting is Prazosin. Carvedilol : Non selective b antagonist that also blocks alpha adrenoreceptor Spironolactone: Direct antagonist of aldosterone, thereby preventing salt retention, myocardial hyperophy and Hypokalemia. Phentolamine : produce a competitive block of alpha1 and alpha 2 receptor.