Read the following four statements (A_D).
(A) Rhino virus infect the nose and respiratory passage but not the lungs.
(B) The lips and finger nails may turn grey to bluish in colour in severe cases of pneumonia.
(C ) Strepotococus pneumoniae infects the alveoli of the lungs.
(D) Intestinal perforation and death may occur in sever cases of typhoid.
how many of the above statements are correct ?

Options

A. One
B. Two
C. Three
D. Four

Answer

To determine how many of the statements (A-D) are correct, we will analyze each statement one by one.

### Step-by-Step Solution:

1. **Statement A**: "Rhinovirus infects the nose and respiratory passage but not the lungs."
- Rhinovirus is known to cause the common cold and primarily affects the upper respiratory tract, including the nose and throat. It does not infect the lungs.
- **Conclusion**: This statement is **correct**.

2. **Statement B**: "The lips and fingernails may turn grey to bluish in color in severe cases of pneumonia."
- In severe pneumonia, due to lack of oxygen (hypoxia), the lips and fingernails can indeed turn bluish (cyanosis).
- **Conclusion**: This statement is **correct**.

3. **Statement C**: "Streptococcus pneumoniae infects the alveoli of the lungs."
- Streptococcus pneumoniae is a common bacterium that causes pneumonia and it infects the alveoli of the lungs, leading to inflammation and fluid accumulation.
- **Conclusion**: This statement is **correct**.

4. **Statement D**: "Intestinal perforation and death may occur in severe cases of typhoid."
- Typhoid fever, caused by Salmonella typhi, can lead to severe complications, including intestinal perforation, which can be life-threatening.
- **Conclusion**: This statement is **correct**.

### Final Conclusion:
All four statements (A, B, C, and D) are correct. Therefore, the answer is that **4 statements are correct**.