Match List-I (Diseases) with List-II (Factors) and select the correct answer using the code given below.List IList IIA. Peptic ulcers1. VirusB. Dengue2. ProtozoaC. Elephant Foot3. WormD. Malaria4. BacteriaMatch List-I (Diseases) with List-II (Factors) and select the correct answer using the code given below.

1. A

   A-(4), B-(2), C-(3), D-(1)

   Option A matches peptic ulcers to bacteria, dengue to protozoa, elephant foot to worm, and malaria to virus. This pairing fails because dengue is caused by a virus and malaria by a protozoa, making this incorrect.

2. B

   A-(4), B-(1), C-(3), D-(2)

   Option B correctly matches peptic ulcers to bacteria (Helicobacter pylori), dengue to virus, elephant foot (lymphatic filariasis) to worm (filarial worm), and malaria to protozoa (Plasmodium). This thorough alignment across all four medical conditions forms the precise correct code set, validating why this option serves as the official key.

3. C

   A-(3), B-(4), C-(2), D-(1)

   Option C pairs peptic ulcers with worm, dengue with bacteria, elephant foot with protozoa, and malaria with virus. These pathogen classifications are entirely reversed and medically inaccurate.

4. D

   A-(2), B-(3), C-(4), D-(1)

   Option D pairs peptic ulcers with protozoa, dengue with worm, elephant foot with bacteria, and malaria with virus. This combination misattributes every single causative agent for the listed human diseases.

Summary. Official key is (b) matching Peptic ulcers to Bacteria, Dengue to Virus, Elephant Foot to Worm, and Malaria to Protozoa. Peptic ulcers are caused by bacterial infections such as Helicobacter pylori. Dengue fever spreads via viral transmission through Aedes mosquitoes. Elephant foot or lymphatic filariasis results from parasitic worms, while malaria is caused by Plasmodium protozoa. Carefully verifying each pathogen type ensures accurate matching against the given list.