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
[{'content': '100 % bioavailability is seen with which route \nSelect and explain. \nA. Oral, B. Intravenous, C. Rectal, D. Subcutaneous', 'role': 'user'}, {'content': 'Answer: B \nExplanation: • Bioavailability is defined as the fraction of unchanged drug reaching the systemic circulation following administration by any route.\nIn case a drug is given orally, the bioavailability shall be less than 100%. This is due to\n■ The incomplete extent of absorption\n■ First\xa0pass metabolism\nRoutes of Administration, Bioavailability, and General Characteristics', 'role': 'assistant'}]