1. A 34-year-old m an presented to his physician com plaining of dry m outh, constipation, and di culty in urination. He also noticed an increase in appetite. The m an had started a therapy with...

1. A 34-year-old m an presented to his physician com plaining of dry m outh, constipation, and di culty in urination. He also noticed an increase in appetite. The m an had started a therapy with cyproheptadine 2 weeks earlier to treat coldinduced urticaria. Drug-induced blockade of w hich of the follow ing pairs of receptors m ost likely m ediated the patient’s sym ptom s? A. Dopam inergic and a1-adrenergic B. H2-histam inergic and m uscarinic C. H2-histam inergic and a1-adrenergic D. Serotonergic and GABAergic E. Muscarinic and serotonergic F. Dopam inergic and GABAergic