Which of the following discases are treated by antibiotics ?
(i) Plague (ii) Diphtheria
(iii) Leprosy (iv) Whooping cough

Options

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

Answer

To determine which of the diseases listed are treated by antibiotics, we need to analyze each disease and identify its causative agent. Antibiotics are effective against bacterial infections, so we will focus on whether each disease is caused by bacteria.

### Step-by-Step Solution:

1. **Identify the diseases and their causative agents**:
- **Plague**: Caused by *Yersinia pestis* (bacterium).
- **Diphtheria**: Caused by *Corynebacterium diphtheriae* (bacterium).
- **Leprosy**: Caused by *Mycobacterium leprae* (bacterium).
- **Whooping cough**: Caused by *Bordetella pertussis* (bacterium).

2. **Determine if each disease is bacterial**:
- Since all four diseases listed are caused by bacteria, they are all treatable with antibiotics.

3. **Conclusion**:
- All the diseases mentioned (plague, diphtheria, leprosy, and whooping cough) can be treated with antibiotics.

### Final Answer:
All of the diseases listed (i.e., plague, diphtheria, leprosy, and whooping cough) are treated by antibiotics.

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