Proponent of germ theory of disease–

Correct option is A

Sol. Louis Pasteur was the first to provide scientific evidence for the germ theory of disease, demonstrating that microorganisms cause infection. His work in fermentation, pasteurization, and vaccination laid the foundation for modern microbiology and hygiene practices in healthcare.
Explanation of each option:
· (a) Louis Pasteur – Correct Answer. Proved that specific microbes cause specific diseases, developed vaccines (e.g., for rabies), and introduced sterilization techniques.
· (b) Robert Hook – Discovered cells through the microscope, but did not relate microorganisms to disease. His work was foundational in cell biology.
· (c) Charles Darwin – Known for his theory of evolution by natural selection. He made no direct contributions to microbiology or germ theory.
· (d) Robert Brown – Discovered the nucleus in plant cells, a significant discovery in cell biology, but unrelated to disease causation.