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 drugs ? \nSelect and explain. \nA. Included in national pharmacopoeia, B. Should always be present at PHC, C. Those that satisfy the primary health care needs of the population, D. Life saving medications', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. is 'c' i.e., Those that satisfy the primary health care needs of the population WHO has defined Essential Medications as those that satisy the priority health care needs of majority of the population.", 'role': 'assistant'}]