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': 'The aim of post-marketing studies is: \nSelect and explain. \nA. Efficacy of the drug, B. Dosage of the drug, C. Deals with alteration of the drug includes absortion, distribution, binding/storage, D. Safety and comparisons with other medicines', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]