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B
Lister
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C
Pasteur
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D
Koch
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Solution
The correct option is D Koch The germ theory of disease states that many diseases are caused by microorganisms. According to this theory, the microorganisms invade humans, animals and other living hosts. This theory was put forth by Robert Koch. He developed a method to test whether a particular microorganism is the cause of a disease. According to his experiments, it was proved that the bacterium Bacillus anthracis was the cause of anthrax disease.