Step 1: Understanding the Question:
We need to match four diseases, Tuberculosis, Diphtheria, Yellow fever, and Malaria, to four causative or preventive categories, Bacterial, Viral, Toxoids, and Protozoal, and then pick the option that lists all four matches correctly.
Step 2: Key Formula or Approach:
Work out the correct category for each disease on its own first, using the causative organism for three of them and the type of vaccine used for the fourth, then compare the result against the given options.
Step 3: Detailed Explanation:
Tuberculosis is caused by Mycobacterium tuberculosis, a bacterium, so it belongs with Bacterial.
Diphtheria is caused by Corynebacterium diphtheriae, but the question groups it with Toxoids because the diphtheria vaccine works by using an inactivated toxin, a toxoid, rather than the whole bacterium.
Yellow fever is caused by a flavivirus spread by Aedes mosquitoes, so it belongs with Viral.
Malaria is caused by Plasmodium species, single celled protozoan parasites spread by Anopheles mosquitoes, so it belongs with Protozoal.
Putting these four matches together gives Tuberculosis-Bacterial, Diphtheria-Toxoids, Yellow fever-Viral, Malaria-Protozoal.
Step 4: Final Answer:
This set of matches corresponds to the option P-1, Q-3, R-2, S-4.