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': 'An acidic drug has pKa value 4.5. Percentage of ionized drug at pH 3.5- \nSelect and explain. \nA. 1%, B. 10%, C. 90%, D. 99%', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., 10% o The degree of ionization of a drug (an organ electrolyte) depends on its pKa value and pH of the environment. 1. For acidic drugs", 'role': 'assistant'}]