17.In a given drug-receptor system, if there are 10 receptors and binding of 10 drug molecules produces the maximum effect. Which of the following statements is MOST appropriate for such ideal hypothetical system? Group of answer choices A.EC50 = KA and there are no spare receptors B.EC50 < KA and there are no spare receptors C.EC50 = KA and there are spare receptors D.EC50 > KA and there are no spare receptors

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