11. A patient has no relief of anginal symptoms despite changing his nitroglycerine patch every morning. Which of the following is the most appropriate course of action?

A. Put the nitroglycerine patch on in the morning and take it off in the evening.

B. Increase the dose of the nitroglycerine patch.

C. Change the nitroglycerine from a patch to isosorbide mononitrate twice daily.

D. Start ranolazine therapy