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: Vaccine Fundamentals.
Vaccines are biological agents conferring acquired immunity to specific diseases. They are typically composed of inactivated or attenuated pathogens.
Step 2: Individual Vaccine Composition Analysis.
- (A) Typhoid vaccine: Contains inactivated *Salmonella typhi* to stimulate immunity.
- (B) Typhus vaccine: Contains inactivated rickettsiae, addressing *Rickettsia* as the causative agent of typhus.
- (C) Measles vaccine: Utilizes attenuated viruses to induce immunity without causing illness.
- (D) Smallpox vaccine: Contains inactivated *Variola* virus to aid the body's defense.
Step 3: Final Correlation.
The established pairings are: (A) - (IV), (B) - (III), (C) - (II), (D) - (I).