This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Social & Preventive Medicine
Who propounded the germ theory of disease - 
Select and explain. 
A. Leeuwenhoek, B. Robert koch, C. Ambroise Pare, D. Louis Pasteur
D: Louis Pasteur
Answer: D: Louis Pasteur 
Explanation: Louis Pasteur (1822-1895) demonstrated by the presence of bacteria in the air, thereby disproving the theory of “spontaneous generation” and proposed “germ theory of disease”