Eggs of placental mammals/human egg are expected to be

Options

A. alecithal
B. polylecithal
C. telolecithal
D. mesolecithal

Answer

### Step-by-Step Solution

1. **Understanding the Question**: The question asks about the type of eggs found in placental mammals, specifically human eggs.

2. **Definition of Yolk**: Yolk is a mixture of proteins, phospholipids, and fats that serves as nourishment for the developing embryo.

3. **Types of Eggs Based on Yolk Amount**:
- **Alacetal**: Eggs with no yolk or minimal yolk.
- **Mesolacetal**: Eggs with a moderate amount of yolk.
- **Macrolacetal**: Eggs with a high amount of yolk.

4. **Types of Eggs Based on Yolk Distribution**:
- **Homolacetal**: Yolk is uniformly distributed throughout the egg.
- **Telolacetal**: Yolk is concentrated at one end of the egg.
- **Centrolacetal**: Yolk is located at the center of the egg.

5. **Analyzing Human Eggs**: Human eggs, being part of placental mammals, receive nourishment from maternal tissues via the placenta. Therefore, they do not require a significant amount of yolk.

6. **Conclusion**: Since human eggs have minimal to no yolk, they are classified as **alacetal** eggs.

7. **Final Answer**: The correct answer is **alacetal**.