3. One year later, the patient returns complaining that his nitro�glycerin works well when he takes it for an acute attack but

that he is now having more frequent attacks and would like
something to prevent them. Useful drugs for the prophylaxis
of angina of effort include
(A) Amyl nitrite
(B) Esmolol
(C) Sublingual isosorbide dinitrate
(D) Sublingual nitroglycerin
(E) Verapamil