Assertion: According to hanstein, there are three histogens in a monocot root.
Reason: In monocot roots, the outermost groups of initials form both root cap and dermatogen.

Options

A. If both Assertin and Reason are true and the Reason is the correct explanatin of the Assertion.
B. If both Assertion and Reason are true, but the Reason is not the correct explanation of the Assertion.
C. If Assertion is true, Reason is false.
D. If both Assertion and Reason are true.

Answer

### Step-by-Step Solution:

1. **Understanding the Assertion**: The assertion states that according to Hanstein, there are three histogens in a monocot root. Histogens refer to the layers of meristematic tissue that give rise to different parts of the plant.

2. **Analyzing the Reason**: The reason provided claims that in monocot roots, the outermost group of initials forms both the root cap and dermatogen. This implies that the outermost layer contributes to both structures.

3. **Identifying the Correct Number of Histogens**: According to Hanstein's histogen theory, there are actually four histogens in monocot roots, not three. These histogens are:
- Dermatogen (which forms the epidermis)
- Periblem (which forms the cortex)
- Plerome (which forms the vascular tissue)
- Calyptrogen (which forms the root cap)

4. **Evaluating the Reason's Accuracy**: The reason is also incorrect because it states that the outermost initials form both the root cap and dermatogen. In reality, the outermost initials form the calyptrogen, which is responsible for the root cap, while the dermatogen forms the epidermis.

5. **Conclusion**: Since both the assertion and the reason are incorrect, we conclude that the correct answer is that both the assertion and reason are false.

### Final Answer:
Both the assertion and reason are false.

---