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': 'Essential medicines are those medicines: \nSelect and explain. \nA. That are needed to treat emergency conditions, B. That are needed to treat serious diseases, C. That satisfy the priority health care needs of the population, D. That are introduced recently into the market', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]