**Core Concept**
Okazaki fragments are short, discontinuous segments of DNA synthesized during the lagging strand replication process. This phenomenon occurs due to the antiparallel nature of DNA strands and the requirement for DNA synthesis to proceed in the 5' to 3' direction. Okazaki fragments are then joined together by DNA ligase to form a continuous strand.

**Why the Correct Answer is Right**
During DNA replication, the leading strand is synthesized continuously, whereas the lagging strand is synthesized discontinuously, resulting in the formation of Okazaki fragments. The lagging strand is synthesized in the 5' to 3' direction, but the new DNA strand is antiparallel to the template strand. To overcome this, Okazaki fragments are synthesized in short gaps, which are later sealed by DNA ligase. This process is crucial for maintaining the integrity of the genome during replication.

**Why Each Wrong Option is Incorrect**
* **Option A:** Incorrect because Okazaki fragments are not formed during the leading strand synthesis, which proceeds continuously.
* **Option B:** Incorrect because Okazaki fragments are not a type of DNA repair mechanism, but rather a product of discontinuous DNA synthesis on the lagging strand.
* **Option C:** Incorrect because Okazaki fragments are not a type of DNA replication intermediate, but rather a result of the discontinuous nature of lagging strand synthesis.

**Clinical Pearl / High-Yield Fact**
Okazaki fragments are a fundamental aspect of DNA replication, and understanding their formation is crucial for grasping the complex process of genome duplication. It's essential to remember that Okazaki fragments are short, discontinuous segments synthesized on the lagging strand, which are later joined together by DNA ligase.

**Correct Answer: D. Lagging strand. DNA synthesis on the lagging strand results in the formation of Okazaki fragments.**