Which of the following group of viruses infect the respiratory passage but not the lungs ?

Options

A. Rhinovirus
B. Coronavirus
C. Pneumococcus
D. Streptococcus

Answer

To solve the question "Which of the following group of viruses infect the respiratory passage but not the lungs?", we can follow these steps:

### Step 1: Understand the Question
We need to identify which virus specifically infects the respiratory passages (like the nose and throat) but does not extend its infection to the lungs.

### Step 2: Analyze the Options
We have four options to consider:
- **Option A: Rhinovirus**
- **Option B: Coronavirus**
- **Option C: Pneumococcus**
- **Option D: Streptococcus**

### Step 3: Evaluate Each Option
- **Rhinovirus (Option A)**: This virus is known to cause the common cold. It primarily infects the upper respiratory tract, which includes the nose and throat. It does not infect the lungs.

- **Coronavirus (Option B)**: This virus can infect both the upper respiratory tract and the lungs. Certain strains, like SARS-CoV-2, are known to cause severe respiratory illness, including pneumonia.

- **Pneumococcus (Option C)**: This refers to Streptococcus pneumoniae, which is a bacterium that can cause pneumonia, thus infecting the lungs.

- **Streptococcus (Option D)**: This is a broader category that includes various species, some of which can also infect the lungs, particularly Streptococcus pneumoniae.

### Step 4: Identify the Correct Answer
From the analysis:
- Rhinovirus is the only virus listed that infects the respiratory passages (nose and throat) but does not infect the lungs.

### Conclusion
The answer to the question is **Option A: Rhinovirus**.

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