**Core Concept**
Nitrate is a vasodilator that acts primarily through the release of nitric oxide (NO), leading to the relaxation of vascular smooth muscle. This results in decreased peripheral resistance and a subsequent decrease in blood pressure.

**Why the Correct Answer is Right**
The correct answer is related to the mechanism of action of nitrate. Nitrate is a potent vasodilator, and its primary effect is to decrease blood pressure by causing vasodilation. This is achieved through the release of nitric oxide, which activates guanylate cyclase, leading to an increase in cyclic guanosine monophosphate (cGMP) and ultimately causing smooth muscle relaxation. The primary action of nitrate is to reduce preload and afterload.

**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect because nitrate does cause vasodilation, which is the primary mechanism of its action.
* **Option B:** This option is incorrect because nitrate does decrease blood pressure, which is a direct result of its vasodilatory effects.
* **Option C:** This option is incorrect because nitrate does increase cardiac output, particularly in the context of heart failure, where it helps to improve cardiac function.

**Clinical Pearl / High-Yield Fact**
It's essential to remember that nitrates are contraindicated in patients with hypotension, as they can further decrease blood pressure and worsen perfusion to vital organs.

**Correct Answer: D. This option is correct because nitrate does not cause...**