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
Multifactorial causation of disease theory was proposed by ? 
Select and explain. 
A. Louis pasteur, B. Pettenkofer, C. Robe koch, D. Aristotle
B: Pettenkofer
Answer: B: Pettenkofer 
Explanation: Ans. is 'b' i.e., Pettenkofer