**Core Concept**
Reactivated tuberculosis (TB) typically involves the **apical and posterior segments of the upper lobes** of the lungs, due to the high oxygen tension in these areas. This is because the causative organism, **Mycobacterium tuberculosis**, is an aerobic bacterium that thrives in well-oxygenated environments.

**Why the Correct Answer is Right**
The correct answer is related to the **upper lobes**, specifically the apical and posterior segments, where oxygen tension is highest. This environment favors the growth of **M. tuberculosis**, leading to reactivation of latent infection. The **apical segments** are particularly prone to reactivation due to their high oxygen levels.

**Why Each Wrong Option is Incorrect**
**Option A:** Incorrect because, while TB can affect any part of the lung, the lower lobes are less commonly involved in reactivated disease.
**Option B:** Incorrect as the middle lobes are not the most common site for reactivated TB.
**Option D:** Incorrect because, although the lower lobes can be involved, they are not the typical location for reactivated TB.

**Clinical Pearl / High-Yield Fact**
A key point to remember is that reactivated TB has a predilection for the **upper lobes**, particularly the apical segments, which is crucial for diagnosis and treatment.

**Correct Answer:** D. upper lobes, near the apex.