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The correct matching of infectious agents with the diseases they cause is given in option 2. Let`s dissect each option to understand why option 2 is correct.
Option 1: This option incorrectly matches the bacterium with tuberculosis and the protozoan with kala-azar. Tuberculosis is caused by a bacterium, not a fungus, and kala-azar is caused by a protozoan, not a bacterium.
Option 2: This option correctly matches the bacterium with tuberculosis and the fungus with ringworm. Tuberculosis is indeed caused by a bacterium, and ringworm is caused by a fungus. The other two matches are incorrect.
Option 3: This option incorrectly matches the bacterium with influenza and the virus with kala-azar. Influenza is caused by a virus, not a bacterium, and kala-azar is caused by a protozoan, not a virus.
Option 4: This option incorrectly matches the bacterium with ringworm and the virus with kala-azar. Ringworm is caused by a fungus, not a bacterium, and kala-azar is caused by a protozoan, not a virus.
Therefore, option 2 is the correct answer. The correct matching is: a