A. Sweden
B. Canada
C. Michigan (USA)
D. California
Answer:
C. Michigan (USA)
To test the hypothesis that adding fluoride would prevent cavities, Dean and his colleagues conducted a controlled experiment by fluoridating the water in Grand Rapids, Michigan, starting 25 January 1945. The results, published in 1950, showed significant reduction of cavities.
CLICK HERE TO VIEW ALL MCQS
No comments:
Post a Comment
Add Your Comments or Feedback Here