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: Pathology
Which of the following is not true about Carvedilol? 
Select and explain. 
A. b1 + b2 + a1 adrenergic receptor blocker, B. Oral bioavailability is almost 80%, C. Has antioxidant propey, D. Cardioprotective in CHF
B: Oral bioavailability is almost 80%
Answer: B: Oral bioavailability is almost 80% 
Explanation: Oral bioavailability of carvedilol is 30%. It is primarily metabolized and has a t1/2 of 2-8 hrs.