Which coronary artery diseases is caused due to narrowing of the lumen of arteries? 

Explanation

**Step-by-Step Solution:**

1. **Understanding Coronary Artery Disease (CAD):**
- Coronary artery disease refers to conditions that affect the arteries supplying blood to the heart muscle. It is primarily characterized by the narrowing or blockage of these arteries.

2. **Identifying the Cause of Narrowing:**
- The narrowing of the lumen (the inner open space of the artery) is a key feature of certain coronary artery diseases. This narrowing can lead to reduced blood flow to the heart muscle, which can cause chest pain (angina) or heart attacks.

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