Okay, let's tackle this question about vertical partial laryngectomy. The question is asking which structures are removed and which are not. First, I need to recall what a vertical partial laryngectomy entails. From what I remember, this procedure is used for treating early-stage laryngeal cancers. The goal is to remove the affected part while preserving as much function as possible.

Vertical partial laryngectomy typically involves removing the anterior commissure and the involved vocal fold. The posterior structures are usually left intact. So, structures removed would include the anterior part of the larynx. Now, the options aren't provided, but let's assume common distractors might include the epiglottis, cricoid cartilage, arytenoid cartilage, and vocal cords.

The correct answer would be a structure that's not removed. For example, the arytenoid cartilage is part of the posterior larynx and is preserved in a vertical partial laryngectomy. The cricoid cartilage is also usually left intact. The epiglottis might be removed in some cases, but not in a vertical partial. The vocal cords on the affected side are removed, but the other side is preserved.

So, the structures not removed would be the posterior ones like the arytenoids and cricoid cartilage. The incorrect options would be structures that are actually removed, like the anterior commissure and the affected vocal cord. I need to make sure the explanation clearly states which structures are removed and why the others are left. Also, the clinical pearl should highlight the preservation of posterior structures to maintain laryngeal function.

**Core Concept**
Vertical partial laryngectomy is a surgical procedure for early glottic cancer, preserving posterior laryngeal structures. Key structures removed include the anterior commissure and the affected vocal cord, while the **arytenoid cartilage** and **cricoid cartilage** are preserved to maintain airway patency and phonation.

**Why the Correct Answer is Right**
The correct answer is a structure **not** removed during the procedure. The **arytenoid cartilage**, located posteriorly, is preserved because vertical partial laryngectomy focuses on anterior and mid-laryngeal resection. The arytenoids are only removed in more extensive surgeries like supracricoid or total laryngectomy. This preservation minimizes functional deficits like swallowing and speech.

**Why Each Wrong Option is Incorrect**
**Option A:** *Anterior commissure* is removed in vertical partial laryngectomy as part of the anterior glottic resection.
**Option B:** *Vocal cord* on the affected side is excised to ensure oncologic clearance.
**Option C:** *Cricoid cartilage* is preserved to maintain airway structure; its removal would necessitate a tracheostomy.

**Clinical Pearl / High-Yield Fact**
Vertical partial laryngectomy spares **posterior structures** (arytenoids, cricoid) to preserve laryngeal function. Contrast this with **horizontal partial laryngectomy**, which removes supraglottic structures and preserves the glottis. Remember: "Vertical = anterior, Horizontal = supraglottic."

**Correct Answer: D. Arytenoid cartilage**

✓ Correct Answer: B. Epiglottis