**Core Concept**
The question is testing the understanding of cataract formation, specifically the type known as complicated cataract. Complicated cataract is associated with **intraocular inflammation** or **uveitis**.

**Why the Correct Answer is Right**
Since the correct answer is not provided, let's discuss the general concept. In a complicated cataract, the opacity develops in the **posterior subcapsular region** of the lens due to the inflammation. This is because the **inflammatory mediators** can affect the lens epithelial cells, leading to their damage and subsequent cataract formation.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because complicated cataract typically does not start here.
**Option B:** Similarly, this is not the typical location.
**Option C:** This option might seem plausible but is incorrect without more context.
**Option D:** This is also incorrect as it does not accurately describe the location of complicated cataract formation.

**Clinical Pearl / High-Yield Fact**
A key point to remember is that complicated cataracts are often associated with **uveitis** or other inflammatory conditions, and the cataract formation can be a complication of the underlying disease process.

**Correct Answer:** D. posterior subcapsular region