Which of the following is a non-communicable disease?

Options

A. Allergy
B. Malaria
C. Diarrhoea
D. Tuberculosis

Answer

To determine which of the following is a non-communicable disease, we need to understand the difference between communicable and non-communicable diseases. Here’s a step-by-step solution:

### Step 1: Define Communicable and Non-Communicable Diseases
- **Communicable diseases** are those that can be transmitted from one person to another. They are often caused by pathogens like bacteria, viruses, or parasites. Examples include malaria, tuberculosis, and AIDS.
- **Non-communicable diseases** are not spread from person to person. They are often chronic conditions that can result from genetic, lifestyle, or environmental factors. Examples include cancer, diabetes, and allergies.

### Step 2: Identify the Options
- Look at the options provided in the question. You need to determine which of the listed diseases is non-communicable.

### Step 3: Analyze Each Option
- **Option 1: Allergy** - Allergies are reactions of the immune system to foreign substances. They are not transmitted from one person to another, making them a non-communicable disease.
- **Option 2: Malaria** - This is a communicable disease caused by parasites transmitted through mosquito bites.
- **Option 3: Diarrhea** - This is typically caused by infections and can be transmitted from one person to another, making it communicable.
- **Option 4: Tuberculosis** - This is also a communicable disease that spreads through the air when an infected person coughs or sneezes.

### Step 4: Conclusion
- Based on the analysis, the only non-communicable disease among the options is **allergy**. Therefore, the correct answer is **Option 1: Allergy**.