Correct option is B
Leprosy (1) is caused by the bacterium Mycobacterium leprae. It primarily affects the skin, nerves, and mucous membranes, leading to long-term health problems.
Plague (2) is caused by the bacterium Yersinia pestis. It is a highly contagious and deadly disease transmitted to humans via fleas from infected rodents.
Mumps (3) is not caused by bacteria but by the mumps virus, a viral infection that primarily affects the salivary glands.
Polio (4) is caused by the poliovirus, not by bacteria. It can lead to paralysis and other severe health complications.
