Assertion`:-` Mesenchymal cells function is formation of other cells of connetive tissue proper.
Reason`:-`Mesenchymal cells are undifferentiated cells of connective tissue.

Options

A. If both Assertion & Reason are True & the Reason is a correct explanation of the Assertion.
B. If both Assertion & Reason are True but Reason is not a correct explanation of the Assertiion.
C. If Assertion is True but the Reason is False.
D. If both Assertion & Reason are False

Explanation

To solve the assertion and reason question regarding mesenchymal cells, we can break it down into a step-by-step analysis:

### Step 1: Understand the Assertion
The assertion states: "Mesenchymal cells function is formation of other cells of connective tissue proper."
- **Explanation**: Mesenchymal cells are a type of stem cell found in connective tissue. They have the ability to differentiate into various types of cells, including those that make up connective tissue such as cartilage, bone, and adipose tissue.

### Step 2: Understand the Reason
The reason states: "Mesenchymal cells are undifferentiated cells of connective tissue."
- **Explanation**: This statement is true. Mesenchymal cells are indeed undifferentiated, meaning they have not yet developed into a specific type of cell. They are multipotent, which means they can develop into multiple types of cells within the connective tissue.

### Step 3: Evaluate the Relationship Between Assertion and Reason
Now we need to determine if the reason correctly explains the assertion.
- The reason explains that mesenchymal cells are undifferentiated, which is crucial for their function in forming other cells of connective tissue. Therefore, the reason supports the assertion.

### Step 4: Conclusion
Both the assertion and the reason are true, and the reason correctly explains the assertion. Thus, the correct answer is:
- **Option A**: Both assertion and reason are true, and reason is the correct explanation of the assertion.