Louis Pasteur made many discoveries in field of:

Explanation

A. Microbiology and Genetics (Incorrect): Louis Pasteur's major discoveries were in microbiology and not specifically in genetics. B. Genetics and Medicines (Incorrect): While Pasteur made significant contributions to medicine, his major discoveries were in microbiology, not genetics. C. (Correct) In the field of microbiology and medicine Pasteur demonstrated that microorganisms cause disease and discovered how to make vaccines from weakened, or attenuated, microbes. He developed the earliest vaccines against fowl cholera, anthrax, and rabies.D. Pathology and Genetics (Incorrect): Pasteur's major contributions were in microbiology and not specifically in genetics or pathology.