statement A – Typhoid Mary was a health worker.
Statement B – Haemophilus influenzae doesn't cause influenza.

Options

A. Only Statement A is correct
B. Only Statement B is correct
C. Both statements A and B are correct .
D. Both statements A and B are incorrect

Answer

To solve the question, we need to evaluate the two statements provided:

**Step 1: Analyze Statement A**
- Statement A claims that "Typhoid Mary was a health worker."
- Typhoid Mary, whose real name was Mary Mallon, was not a health worker in the traditional sense (like a nurse or doctor). Instead, she was a cook who unknowingly carried the typhoid bacteria (Salmonella typhi) and spread the disease through the food she prepared. Therefore, this statement is incorrect.

**Step 2: Analyze Statement B**
- Statement B states that "Haemophilus influenzae doesn't cause influenza."
- Haemophilus influenzae is indeed a bacterium and is not responsible for causing influenza. The disease influenza is caused by the influenza virus. Haemophilus influenzae can cause other illnesses, such as pneumonia and meningitis, but not influenza. Therefore, this statement is correct.

**Step 3: Conclusion**
- Based on the analysis, Statement A is incorrect while Statement B is correct. Thus, the correct option is that only Statement B is correct.

### Summary of the Solution:
- Statement A: Incorrect (Typhoid Mary was a cook, not a health worker)
- Statement B: Correct (Haemophilus influenzae does not cause influenza)
- Final Answer: Only Statement B is correct.