**Core Concept:** The pleura is a serous membrane that lines the inside of the thoracic cavity, covering the lungs and forming the pleural cavity. The pleural reflection is a fold of the visceral pleura that moves medially beyond the costal margin, providing attachment points for the intercostal muscles and nerves. The left midaxillary line is a reference point that divides the left chest wall into five intercostal spaces.

**Why the Correct Answer is Right:** The correct answer, option D (6th intercostal space), is located on the left midaxillary line. In this position, the pleural reflection is in the 6th intercostal space, which is the most medial intercostal space on the left side.

**Why Each Wrong Option is Incorrect:**

A. Option A (5th intercostal space) is incorrect because it is located more lateral than the pleural reflection.
B. Option B (7th intercostal space) is incorrect because it is located more lateral than the pleural reflection.
C. Option C (left lateral chest wall) is incorrect because it is a broad description of the location and not a specific intercostal space.

**Clinical Pearl:** Understanding the location of the pleural reflection and its relationship to the left midaxillary line is crucial for clinical practice, particularly in procedures involving the left pleural space or the left chest wall, such as thoracentesis or biopsy. Familiarity with this anatomical landmark helps to avoid complications and improve the success rate of procedures.