This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous, Subject name: Microbiology
[{'content': 'Germ theory of disease was proposed by? \nSelect and explain. \nA. Louis Pasteur, B. Ronald Ross, C. Edward jenner, D. Robert koch', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. (a) Louis PasteurRef: Park 20/e, p 5, Ananthnarayan 7/e, p 5-7, Jawetz's 24/e, chapter 34", 'role': 'assistant'}]