What term is used for the chemical which occurs in the sperm's acrosome and helps in the sperm's entry into the egg?

Explanation

**Step-by-Step Solution:**

1. **Identify the Structure**: The question asks about a chemical found in the sperm's acrosome. The acrosome is a cap-like structure located at the head of the sperm.

2. **Understand the Function of the Acrosome**: The acrosome contains enzymes that play a crucial role in the fertilization process. Its primary function is to help the sperm penetrate the protective layers surrounding the egg (ovum).

3. **Recognize the Protective Layers of the Ovum**: The ovum is surrounded by three protective layers:
- The Vitelline Membrane
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