A PCAT passage describes an 'agonist' and an 'antagonist' at the same receptor. Which relationship is most directly implied?
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A
An agonist activates the receptor while an antagonist blocks activation without producing a response
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B
An agonist and antagonist both activate the receptor but through different pathways
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C
An agonist reduces receptor sensitivity while an antagonist increases it
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D
An agonist binds irreversibly and an antagonist binds reversibly to the same site