Question

Match List-I with List-II: 
 \[ \begin{array}{|l|l|} \hline \textbf{List-I (Vaccines)} & \textbf{List-II (Their respective contents)} \\ \hline A. \ \text{Typhoid vaccine} & I. \ \text{Killed rickettsia} \\ B. \ \text{Typhus vaccine} & II. \ \text{Killed bacteria} \\ C. \ \text{Measles vaccine} & III. \ \text{Attenuated viruses} \\ D. \ \text{Smallpox vaccine} & IV. \ \text{Killed viruses} \\ \hline \end{array} \]

• A. (A) - (IV), (B) - (III), (C) - (II), (D) - (I)
• B. (A) - (III), (B) - (II), (C) - (IV), (D) - (I)
• C. (A) - (III), (B) - (I), (C) - (IV), (D) - (II)
• D. (A) - (IV), (B) - (III), (C) - (II), (D) - (I)
• E.

Hint:

Vaccines can either contain killed organisms (bacteria or viruses) or attenuated (weakened) organisms that still stimulate the immune response.

Answer 1

The Correct Option is A

Step 1: Understanding the vaccines.
Vaccines are biological preparations that provide acquired immunity to specific diseases. They typically consist of killed or weakened (attenuated) forms of pathogens.
Step 2: Analyze each vaccine and its contents.
- (A) Typhoid vaccine: The Typhoid vaccine contains killed bacteria, which helps in the development of immunity against *Salmonella typhi*.
- (B) Typhus vaccine: This vaccine contains killed rickettsia, as typhus is caused by *Rickettsia* bacteria.
- (C) Measles vaccine: This vaccine contains attenuated (weakened) viruses, which induce immunity without causing disease.
- (D) Smallpox vaccine: The smallpox vaccine contains killed viruses, as it helps the body fight against the *Variola* virus.
Step 3: Conclusion.
The correct matching is: (A) - (IV), (B) - (III), (C) - (II), (D) - (I).