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The given question asks us to determine which of the given pairs of disease and causative organisms is correctly matched. Let`s analyze each option to find the correct pair:
Option 1: 1 and 2
According to this option, Ascariasis is caused by bacteria and Hepatitis is caused by a virus. This pair is not correctly matched since Ascariasis is actually caused by a parasitic roundworm called Ascaris lumbricoides. So, option 1 is incorrect.
Option 2: 2 only
According to this option, Hepatitis is caused by a virus. This is correct because Hepatitis is commonly caused by different types of viruses such as hepatitis A, B, C, etc. Hence, option 2 is correct.
Option 3: 1 and 3
According to this option, Ascariasis is caused by bacteria and Tetanus is caused by protozoa. This pair is incorrect as Ascariasis is caused by a roundworm and Tetanus is caused by a bacterium named Clostridium tetani. Therefore, option 3 is incorrect.
Option 4: 3 only
According to this option, Tetanus is caused by protozoa. This is incorrect since Tetanus is caused