**Core Concept**
Urticarial lesions, commonly known as hives, are a type of skin manifestation characterized by the presence of wheals, which are localized areas of raised, itchy skin. This phenomenon is a result of the release of histamine and other chemical mediators from mast cells in the skin, leading to increased vascular permeability and smooth muscle contraction.

**Why the Correct Answer is Right**
The correct answer choice describes the pathophysiology behind urticarial lesions. When mast cells are activated, they release histamine and other mediators, which bind to receptors on nearby blood vessels and smooth muscle cells. This binding causes the blood vessels to dilate and become permeable, leading to the characteristic wheal and flare reaction. The increased permeability allows fluid and white blood cells to leak into the interstitial space, causing the raised, itchy lesions.

**Why Each Wrong Option is Incorrect**
**Option A:** This choice might be tempting, but it doesn't accurately describe the pathophysiology of urticarial lesions. While inflammation is indeed a component of the reaction, it's not the most accurate description of the phenomenon.
**Option B:** This choice is incorrect because urticarial lesions are not primarily caused by the release of bradykinin. While bradykinin can play a role in some types of edema, it's not the primary mediator responsible for the wheal and flare reaction.
**Option C:** This choice is incorrect because the wheal and flare reaction is not primarily caused by the release of serotonin. While serotonin can play a role in some types of vasodilation, it's not the primary mediator responsible for urticarial lesions.

**Clinical Pearl / High-Yield Fact**
When assessing patients with urticarial lesions, it's essential to consider potential triggers, such as allergies, infections, or medications. A thorough history and physical examination can help identify the underlying cause and guide treatment.

**Correct Answer: D. Wheal and flare reaction due to histamine release.**