This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Anti Adrenergic System, Subject name: Pharmacology
All are true regarding prazosin, EXCEPT : 
Select and explain. 
A. First dose effect, B. Impaired glucose tolerance, C. Selective alpha-1 blocker, D. Is an antihypertensive drug
B: Impaired glucose tolerance
Answer: B: Impaired glucose tolerance 
Explanation: Ans. is 'b' Impaired glucose tolerance * "Prazosin improves the carbohydrate metabolism.It also improves lipid profile lower LDL, increase HDL"