[A]: Hershey and Chase experiment showed that protein is the genetic material of `T_2` bacteriophage.
[R]: According to Hershey and Chase, RNA is the genetic material in `T_2` bacteriophage.

Options

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

Answer

To solve the question regarding the statements A and R about the Hershey and Chase experiment, we will analyze each statement step by step.

### Step-by-Step Solution:

1. **Understanding Statement A**:
- Statement A claims that "Hershey and Chase experiment showed that protein is the genetic material of T2 bacteriophage."
- The Hershey and Chase experiment was designed to determine whether DNA or protein was the genetic material. They used T2 bacteriophage, which is a virus that infects bacteria.

2. **Analyzing the Experiment**:
- Hershey and Chase used two types of radioactive isotopes: radioactive sulfur (which labels proteins) and radioactive phosphorus (which labels DNA).
- They found that after the bacteriophage infected the bacteria, only the radioactive phosphorus (indicating DNA) was found inside the bacteria, while the radioactive sulfur (indicating protein) remained outside.

3. **Conclusion from the Experiment**:
- The conclusion drawn from the experiment was that DNA, not protein, is the genetic material of the T2 bacteriophage. Therefore, Statement A is incorrect.

4. **Understanding Statement R**:
- Statement R claims that "According to Hershey and Chase, RNA is the genetic material in T2 bacteriophage."
- The experiment specifically focused on DNA and did not involve RNA. Hershey and Chase concluded that DNA is the genetic material, not RNA.

5. **Conclusion for Statement R**:
- Since the experiment concluded that DNA is the genetic material, Statement R is also incorrect.

6. **Final Answer**:
- Both statements A and R are false. The correct conclusion from the Hershey and Chase experiment is that DNA is the genetic material of T2 bacteriophage.

### Summary:
- **A**: False (It showed DNA is the genetic material, not protein).
- **R**: False (It did not state RNA as the genetic material; it stated DNA).