(A]: Rabies is an acute infectious disease of mammals affecting CNS to cause paralysis and death.
[R]: This is caused due to neurotropic filter- able bacteria in saliva of rabid animals.

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

### Step-by-Step Solution:

1. **Understanding the Assertion (A)**:
- The assertion states that "Rabies is an acute infectious disease of mammals affecting the CNS to cause paralysis and death."
- This statement is accurate as rabies is indeed an infectious disease that primarily affects mammals, particularly through the bite of infected animals, and it leads to severe neurological symptoms, including paralysis and can ultimately result in death.

2. **Understanding the Reason (R)**:
- The reason given is "This is caused due to neurotropic filterable bacteria in saliva of rabid animals."
- This statement is incorrect because rabies is caused by a virus known as the rabies virus (Lyssavirus), not bacteria. The virus is present in the saliva of infected animals, but it is not a filterable bacterium.

3. **Evaluating the Truth of A and R**:
- Since the assertion (A) is true and the reason (R) is false, we can conclude the relationship between the two statements.

4. **Conclusion**:
- The correct option for this assertion-reason question is that the assertion is true and the reason is false.

### Final Answer:
- The assertion is true, and the reason is false.

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