This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Gynaecology & Obstetrics
Labetalol is an 
Select and explain. 
A. Alpha 1 blocker, B. Alpha 2 blocker, C. Alpha 1 and selective beta 1 blocker, D. Alpha 1 and non-selective beta blocker
D: Alpha 1 and non-selective beta blocker
Answer: D: Alpha 1 and non-selective beta blocker 
Explanation: Labetalol is a commonly used a 1 and non-selective b-adrenergic blockerDose: 200-2400mg/day, orally in two to three divided dosesIn an emergency: 20mg IV, followed by 20-80mg every 20min to a maximum of 220mg. Avoid in patients with Asthma, congestive cardiac failure, Liver failure(Ref: William's Obstetrics; 25th edition)