Assertion : Organisms are named according to binomial nomenclature.
Reason : Names consist of two words-one scientific and other vernacular.

Options

A. If both assertion and reason are true and reason is the correct explanation of assertion.
B. If both assertion and reason are true but reason is not the correct explanation of assertion.
C. If assertion is true but reason is false.
D. If both assertion and reason are false.

Explanation

### Step-by-Step Text Solution:

1. **Understanding the Assertion**: The assertion states that "Organisms are named according to binomial nomenclature." This is true. Binomial nomenclature is a formal system of naming species of living things by giving each a name composed of two parts.

2. **Understanding the Reason**: The reason provided is "Names consist of two words - one scientific and other vernacular." This is misleading. In binomial nomenclature, the names consist of two scientific words: the first word is the genus name and the second word is the species name. There is no vernacular (common) name included in the scientific naming.

3. **Analyzing the Relationship**: Since the assertion is true but the reason is false, we conclude that while organisms are indeed named using binomial nomenclature, the explanation given in the reason does not accurately describe this system.

4. **Conclusion**: Based on the analysis, the correct answer is that the assertion is true and the reason is false.