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: Dental
"Multifactorial Causation" theory was given by 
Select and explain. 
A. McMohan Pugh, B. Pettenkofer of Munich, C. Winslow, D. Robert Koch
B: Pettenkofer of Munich
Answer: B: Pettenkofer of Munich 
Explanation: None