identify among the following 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

Answer

To identify the infectious diseases among the options provided (i.e., cancer, influenza, allergy, and smallpox), we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Definitions**:
- **Infectious Diseases**: These are diseases caused by pathogens (such as bacteria, viruses, fungi, or parasites) that can be transmitted from one individual to another.
- **Non-Infectious Diseases**: These diseases are not caused by pathogens and can result from genetic, environmental, or lifestyle factors.

2. **Analyze Each Option**:
- **Cancer**: This is a non-infectious disease characterized by the abnormal growth of cells, often due to genetic mutations or lifestyle factors. It is not caused by any infectious agent.
- **Influenza**: This is an infectious disease caused by the influenza virus. It is contagious and can spread from person to person.
- **Allergy**: Allergies are non-infectious reactions to allergens (such as pollen, dust, or certain foods). They are not caused by pathogens.
- **Smallpox**: This is an infectious disease caused by the variola virus. It is also contagious and can spread between individuals.

3. **Identify the Infectious Diseases**:
- From the analysis, we can conclude that:
- **Influenza** is an infectious disease.
- **Smallpox** is also an infectious disease.
- Therefore, the infectious diseases among the options are **influenza** and **smallpox**.

### Final Answer:
The infectious diseases from the options provided are **ii) Influenza** and **iv) Smallpox**.

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