(B) The term "antihistamine" refers specifically to $H_1$ antagonists,which are also known as $H_1-$receptor antagonists or $H_1-$antihistamines. Thes

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(B) The term "antihistamine" refers specifically to $H_1$ antagonists,which are also known as $H_1-$receptor antagonists or $H_1-$antihistamines. These drugs are used to treat symptoms of allergies by blocking the action of histamine at the $H_1$ receptor sites.