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
In grand rapid survey (1945) of water fluoridation, which city was used as control? 
Select and explain. 
A. Kingston, B. Muskegon, C. Oakpark, D. Evanston
B: Muskegon
Answer: B: Muskegon 
Explanation: None