Given below are four statements (a-d) each with one or two blanks. Select the option which correctly fills up the blanks in the two statements.
(a) Plague is caused by .....(i)..... a deadly bacterium. .....(ii)..... the most common form of plague is characterized by high fever, weakness and acute painful swellings of the lymph nodes.
(b) Filariasis is characterized by swelling of the .....(i)..... and of other parts of the body. The disease, therefore, is commonly known as .....(ii)..... due to its resemblance to the leg of an elephant.
(c) .....(i).....is the resistance to infection which an individual possesses by virtue of his/her genetic and constitutional makeup.
(d) .....(i)..... literally means "protection against self"; .....(ii)..... is an example of it.