<prompt> Which of the following propey of the drug will enable it to be used in low concentration?High affinityHigh specificityLow specificityHigh stability  <response>: Affinity is the ability of the drug to bind with the receptor The receptor occupancy by the drug is needed to elicit a response, so drug with hyper affinity will occupy a larger number of receptor and produce more response at a given concentration than a drug with lower affinity. Ref: KD Tripathi 8th ed 