**Core Concept**
The question is testing the knowledge of histopathological features of small cell carcinoma of the lung, specifically the phenomenon of DNA release from tumor cells and its effect on surrounding blood vessels. This concept is related to **tumor necrosis** and **apoptosis**.

**Why the Correct Answer is Right**
The correct answer is related to the presence of smudged hematoxophilic material in the walls of blood vessels, which is a result of DNA release from necrotic tumor cells. This material is composed of **DNA** and other cellular debris that has been released from the tumor cells and has accumulated in the blood vessel walls.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not accurately describe the phenomenon of DNA release from tumor cells.
**Option B:** This option is also incorrect as it does not relate to the specific histopathological feature described in the question.
**Option C:** This option is incorrect because it is not a recognized term for the described phenomenon.

**Clinical Pearl / High-Yield Fact**
The phenomenon described is a characteristic feature of small cell carcinoma of the lung and is known as **Azzopardi effect**. This effect is a result of the high turnover rate of tumor cells and the resulting necrosis and apoptosis.

**Correct Answer:** D. Azzopardi effect