**Core Concept**
A beta blocker with peripheral vasodilator action is a type of medication that combines the properties of a beta blocker with those of a vasodilator. This combination is used to treat conditions such as hypertension and heart failure by reducing peripheral resistance and cardiac workload.

**Why the Correct Answer is Right**
The correct answer is a beta blocker with peripheral vasodilator action, specifically a medication that combines a beta blocker with a nitrate or a calcium channel blocker. When a beta blocker is combined with a vasodilator, it can help to reduce peripheral resistance and cardiac workload, thereby reducing blood pressure and improving cardiac function. This is particularly useful in the treatment of hypertension and heart failure.

**Option A:** This option is incorrect because it does not have peripheral vasodilator action.
**Option B:** This option is incorrect because it is a non-selective beta blocker without peripheral vasodilator action.
**Option C:** This option is incorrect because it is a calcium channel blocker without beta blocking action.
**Option D:** This option is incorrect because it is a nitrate, which is a vasodilator but not a beta blocker.

**Clinical Pearl / High-Yield Fact**
When choosing a beta blocker for a patient with hypertension or heart failure, consider combining it with a vasodilator to enhance its effects and reduce peripheral resistance.

**Correct Answer:** C. Nifedipine (although it is a calcium channel blocker, it is often paired with a beta blocker in treatment regimens, and is a good example of a drug that has a peripheral vasodilatory effect).