This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Pharmacokinetics, Subject name: Pharmacology
Essential drug is? 
Select and explain. 
A. Drugs that has been developed specifically to treat a rare medical condition, B. Those drugs that satisfy the health care needs of the majority of the population, C. Those drugs that satisfy the health care needs of at least 50% of the population, D. Drug that is to be used with in first hour of the acute attack of the disease
B: Those drugs that satisfy the health care needs of the majority of the population
Answer: B: Those drugs that satisfy the health care needs of the majority of the population 
Explanation: ANSWER: (B) Those drugs that satisfy the health care needs of the majority of the populationREF: KDT 6th edition page 5Essential drugs (medicines), as defined by the World Health Organization (WHO) are "those drugs that satisfy the health care needs of the majority of the population; they should therefore be available at all times in adequate amounts and in appropriate dosage forms, at a price the community can afford.