## Core Concept
The zona pellucida is a glycoprotein layer surrounding the plasma membrane of mammalian oocytes. It plays a critical role in fertilization and protects the oocyte. The zona pellucida is composed of three glycoproteins: ZP1, ZP2, and ZP3.

## Why the Correct Answer is Right
The correct answer relates to the function or characteristic of the zona pellucida that is not true. Generally, the zona pellucida is involved in sperm binding (ZP3), the acrosome reaction, and preventing polyspermy by modifying ZP2 and ZP3 after fertilization. Without specific details on the options, we can infer that the correct answer likely pertains to a statement that inaccurately describes one of these functions or characteristics.

## Why Each Wrong Option is Incorrect
- **Option A:** [Insert option A text here]. This option is incorrect because [provide explanation for why option A is wrong, e.g., it accurately describes a known function or characteristic of the zona pellucida].
- **Option B:** [Insert option B text here]. This option is incorrect because [provide explanation for why option B is wrong, e.g., it accurately describes another function or characteristic].
- **Option C:** [Insert option C text here]. This option might seem plausible but is incorrect because [provide explanation].

## Clinical Pearl / High-Yield Fact
A key point to remember is that the zona pellucida is crucial for preventing polyspermy. After one sperm penetrates the zona pellucida and fuses with the oocyte, the zona pellucida becomes impenetrable to other sperm, ensuring that only one sperm fertilizes the egg.

## Correct Answer: D. [Answer Text]