Incorrect about common cold is:-

Options

A. Common cold usually last 3-7 days
B. Characterised by nasal congestion and discharge
C. It infects nose and respiratory passage including lungs
D. Droplet infection

Answer

To determine which statement about the common cold is incorrect, we will analyze the characteristics and symptoms of the common cold step by step.

### Step-by-Step Solution:

1. **Understanding the Cause**:
- The common cold is caused by viruses. This is a fundamental characteristic of the common cold.
- **Hint**: Identify the causative agent of the disease.

2. **Identifying Symptoms**:
- Common symptoms include nasal congestion, runny nose, sore throat, and sometimes a cough. These symptoms are primarily due to inflammation and excess mucus production.
- **Hint**: List the common symptoms associated with the condition.

3. **Duration of the Illness**:
- The common cold typically lasts between 3 to 7 days. This is an important detail when considering the nature of the illness.
- **Hint**: Recall how long the symptoms usually persist.

4. **Site of Infection**:
- The common cold primarily infects the upper respiratory tract, specifically the nose and throat. It does not typically involve the lungs.
- **Hint**: Determine which parts of the respiratory system are affected by the infection.

5. **Transmission Method**:
- The common cold is transmitted through respiratory droplets when an infected person coughs or sneezes. This makes it contagious.
- **Hint**: Consider how the disease spreads from one person to another.

6. **Analyzing the Incorrect Statement**:
- The incorrect statement about the common cold would be one that claims it infects the lungs or suggests that it does not affect the nose and throat. Since the common cold primarily affects the upper respiratory tract, including the nose and throat, any statement indicating otherwise would be incorrect.
- **Hint**: Look for statements that contradict the established facts about the common cold.

### Conclusion:
Based on the analysis, the statement that suggests the common cold infects the lungs or does not affect the nose and throat is incorrect. The common cold is confined to the upper respiratory tract, primarily affecting the nose and throat.