Procainamide differs from quinidine in the following respects that A: it has little anticholinergic effect B: it can inhibit Na+ channel C: it has no α-adrenergic blocking activity D: it does not cause paradoxical tachycardia

Both phentolamine and prazosin A: are competitive antagonist at α1 adrenergic receptors B: have potent direct vasoconstrictor actions on vascular smooth muscle C: enhance gastric acid secretion through a histamine -like effect D: cause hypotension and bradycardia E: are used chronically for the treatment of primary hypertension