**Core Concept**
The distal end of the humerus, which forms the elbow joint, develops from multiple ossification centers. This process involves the coordinated growth and fusion of various cartilaginous structures. Understanding the number of centers is crucial for grasping the overall anatomy of the elbow.

**Why the Correct Answer is Right**
The distal end of the humerus develops from four primary ossification centers: one for the capitellum, one for the trochlea, one for the medial epicondyle, and one for the lateral epicondyle. These centers appear at different times during fetal development and eventually fuse to form the adult distal humerus. The capitellum and trochlea are the first to appear, followed by the medial and lateral epicondyles. This complex process ensures the formation of a strong and functional elbow joint.

**Why Each Wrong Option is Incorrect**
**Option A:** Two centers (one for the capitellum and one for the trochlea) are not sufficient to explain the development of the entire distal humerus, which includes the epicondyles.

**Option B:** Five centers are not required for the development of the distal humerus, as the number of ossification centers is relatively consistent across individuals.

**Option C:** Three centers (one for the capitellum, one for the trochlea, and one for the epicondyles combined) are not accurate, as the epicondyles develop from separate centers.

**Clinical Pearl / High-Yield Fact**
It's essential to remember that the number of ossification centers can vary between individuals, and in some cases, extra or accessory centers may be present. However, the typical number of centers for the distal humerus is four.

**✓ Correct Answer: D. 4. The distal end of the humerus develops from 4 centres.**