**Core Concept**
The upper limit for ventricular wall thickness is a crucial measurement in cardiac anatomy, particularly in the context of diagnosing hypertrophic cardiomyopathy or other cardiac conditions. **Ventricular wall thickness** is measured to assess the heart's muscular walls.

**Why the Correct Answer is Right**
The normal thickness of the ventricular wall, specifically the left ventricle, is typically up to 11 mm. Thickness beyond this range can indicate pathology.

**Why Each Wrong Option is Incorrect**
**Option A:** Incorrect as it underestimates the normal range.
**Option B:** Incorrect as it overestimates the normal range.
**Option D:** Incorrect as it significantly overestimates the normal range.

**Clinical Pearl / High-Yield Fact**
Remember, a ventricular wall thickness exceeding 15 mm is often associated with **hypertrophic cardiomyopathy**.

**Correct Answer:** D. 11 mm