Assertion (A) : Mary Mallon continued to spread typhoid for many years. Reason (R) : Salmonella typhi generally enters the small intestine through food and water contaminated with it.

Options :

1. Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A).

2. Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of the Assertion (A).

3. Assertion (A) is true, but Reason (R) is false.

4. Assertion (A) is false, but Reason (R) is true