Diseases are broadly grouped into infectious and non-infectious diseases. In the list given below, identify the infectious diseases. (i) Cancer (ii) Influenza (iii) Allergy (iv) Small pox

Options

A. (i) and (ii)
B. (ii) and (iii)
C. (iii) and (iv)
D. (ii) and (iv)

Explanation

To identify the infectious diseases from the given list, we need to understand the definitions and characteristics of infectious and non-infectious diseases.

### Step-by-step Solution:

1. **Understand Infectious Diseases**: Infectious diseases are caused by pathogens (like bacteria, viruses, fungi, or parasites) and can be transmitted from one person to another. Examples include the flu, tuberculosis, and smallpox.

2. **Understand Non-Infectious Diseases**: Non-infectious diseases are not caused by pathogens and cannot be transmitted from one person to another. Examples include cancer, allergies, and diabetes.

3. **Analyze Each Disease in the List**:
- **(i) Cancer**: This is a non-infectious disease characterized by the uncontrolled growth of cells. It is not transmitted from one person to another.
- **(ii) Influenza**: This is an infectious disease caused by the influenza virus. It spreads easily from person to person, especially during flu season.
- **(iii) Allergy**: Allergies are non-infectious responses of the immune system to certain substances (allergens). They do not spread from person to person.
- **(iv) Smallpox**: This is an infectious disease caused by the variola virus. It was highly contagious and could spread rapidly from person to person.

4. **Identify the Infectious Diseases**: Based on the analysis:
- **Infectious Diseases**: Influenza, Smallpox
- **Non-Infectious Diseases**: Cancer, Allergy

### Final Answer:
The infectious diseases from the list are **Influenza** and **Smallpox**.

---