This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General Pharmacology, Subject name: Pharmacology
After oral administration, the fraction of drug reaching the site of circulation is known as: 
Select and explain. 
A. Elimination, B. Bioavailability, C. Clearance, D. Distribution
B: Bioavailability
Answer: B: Bioavailability 
Explanation: Ans. B. BioavailabilityThe fraction of drug reaching the site of circulation is known as bioavailability. IT is measured via area under the curve. Clearance is volume of plasma which is cleared from the drug per unit time. Distribution and elimination are parameters of pharmacokinetics.