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Which of the following drugs are useful when blocking of message is required?

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Which of the following drugs are useful when blocking of message is required?
A. Antagonists
B. Antigens
C. Agates
D. Agonist
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Antagonists bind to the receptor site and inhibit its natural function. Agonists are useful when there is lack of natural chemical messenger. These drugs mimic the natural messenger by switching on the receptor.
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