Final answer:
An example of a calcium channel blocker is Diltiazem, known by the brand names Cardizem and Tiazac (option C).
Step-by-step explanation:
An example of a calcium channel blocker is Diltiazem, which is marketed under the brand names Cardizem and Tiazac. Calcium channel blockers are a class of medications that are used to treat various cardiovascular conditions, such as hypertension (high blood pressure) and angina (chest pain). They work by inhibiting the entry of calcium ions into the heart and blood vessel walls, which leads to relaxation of the blood vessels and a decrease in heart rate.
Hence, the answer is option C.