## Core Concept
Fertilization is the process by which male and female gametes fuse to form a zygote, marking the initiation of pregnancy. This process involves the union of a sperm and an egg, resulting in the formation of a single cell that contains genetic material from both parents. The key outcomes of fertilization include the restoration of the diploid number of chromosomes, initiation of embryonic development, and the beginning of the formation of a new individual.

## Why the Correct Answer is Right
The correct answer, ., implies that the option does not accurately describe a result of fertilization. Typically, results of fertilization include:
- The formation of a zygote
- Restoration of the diploid number of chromosomes (46 in humans)
- Initiation of cleavage and embryonic development
- Genetic diversity through the mixing of parental genetic material

## Why Each Wrong Option is Incorrect
- **Option A:** If option A describes a recognized outcome of fertilization (e.g., formation of a zygote, restoration of diploidy), it would be incorrect to say it is not a result of fertilization.
- **Option B:** Similarly, if option B accurately represents a consequence of fertilization (like the start of embryonic development), it would be wrong to exclude it.
- **Option C:** This option would also be incorrect if it accurately describes a fertilization outcome.

## Clinical Pearl / High-Yield Fact
A key point to remember is that fertilization results in the formation of a zygote, which then undergoes several cleavage divisions without significant growth, leading to the formation of a blastocyst before implantation in the uterus. Understanding the immediate outcomes of fertilization is crucial for grasping early embryonic development and the potential sites for intervention in cases of infertility.

## Correct Answer: D.