Explain why only the ACE inhibitor was discontinued

Mr. Tinsley returns to the clinic 1 month later for reevaluation. His blood pressure is 140/72 and he is complaining of an irritating cough. The healthcare provider discontinued the ACE inhibitor and started on diltiazem (Cardizem).

a)Explain why only the ACE inhibitor was discontinued.

b)How does diltiazem treat hypertension?

c)Mr. Tinsley says that his BP is really not that high so why does he really need this medication. How should you respond?