**Core Concept**
Raynaud's disease is a disorder that affects blood flow to the fingers and toes, and sometimes the ears, nose, and lips. It is characterized by a sudden and temporary narrowing of blood vessels in response to cold temperatures or stress, leading to a reduction in blood flow and subsequent tissue ischemia.

**Why the Correct Answer is Right**
The correct answer is related to the pathophysiology of Raynaud's disease. The condition involves an abnormal response to cold temperatures or stress, leading to the contraction of smooth muscle in the blood vessels, which narrows the vessel lumen. This is mediated by the release of various neurotransmitters, including norepinephrine and acetylcholine, which stimulate alpha-adrenergic receptors on the smooth muscle cells. The resultant vasospasm reduces blood flow to the affected areas, causing the characteristic color changes and tissue ischemia.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because Raynaud's disease is characterized by a vasospastic response to cold temperatures or stress, which is not seen in conditions that primarily involve inflammation or infection of the blood vessels.
**Option B:** This option is incorrect because Raynaud's disease is not typically associated with a significant inflammatory response, which is more characteristic of autoimmune or infectious conditions.
**Option C:** This option is incorrect because Raynaud's disease is a primary disorder of blood vessels, not a secondary consequence of an underlying condition such as atherosclerosis or hypertension.

**Clinical Pearl / High-Yield Fact**
Raynaud's disease is often associated with other autoimmune disorders, such as lupus or scleroderma, and can be triggered by certain medications, including beta-blockers and certain antidepressants. It is essential to consider these potential associations when evaluating patients with Raynaud's disease.

**Correct Answer: D.**