The membranous cover of the ovum at ovulation is

Options

A. corona radiata
B. zona radiata.
C. zona pellucida.
D. chorion

Explanation

To answer the question "The membranous cover of the ovum at ovulation is," we need to identify the correct layer surrounding the ovum during the ovulation process. Here’s a step-by-step solution:

### Step 1: Understand the Structure of the Ovum
The ovum, or egg, has several layers surrounding it. The innermost layer is the ovum itself.

**Hint:** Remember that the ovum is the reproductive cell, and it has protective layers around it.

### Step 2: Identify the Layers Surrounding the Ovum
The layers surrounding the ovum include:
- **Zona Pellucida**: This is the layer directly surrounding the ovum.
- **Corona Radiata**: This is the outermost layer that consists of follicular cells.

**Hint:** Think about the order of layers from innermost to outermost.

### Step 3: Determine the Outermost Layer at Ovulation
At the time of ovulation, the outermost layer that covers the ovum is the **Corona Radiata**. This layer is made up of cells that provide support and nourishment to the ovum.

**Hint:** Focus on what layer is present at the very outer edge during the ovulation process.

### Step 4: Eliminate Incorrect Options
- **Zona Radiata**: This term is not commonly used in reference to the layers of the ovum.
- **Zona Pellucida**: While it is a layer surrounding the ovum, it is not the outermost layer at ovulation.

**Hint:** Make sure to differentiate between the layers based on their position relative to the ovum.

### Conclusion
The correct answer to the question is that the membranous cover of the ovum at ovulation is the **Corona Radiata**.

**Final Answer:** Corona Radiata