This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pharmacology
A person has given 0.175 gm oral digoxin with bioavailabilty 70%. The amount of drug reaching in systemic circulation is: 
Select and explain. 
A. 0.175, B. 0.175 x 0.7, C. 0.175/7, D. 0.175 + 0.7
B: 0.175 x 0.7
Answer: B: 0.175 x 0.7 
Explanation: Ans. (B) 0.175 x 0.7Amount of drug reaching in systemic circulation= drug dose given x bioavailability= 0.175 gm x 70/100= 0.175 gm x 0.7