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
Flouride poisoning occurs in 
Select and explain. 
A. Village workers, B. Tooth paste workers, C. Cryolite workers, D. Phosphorus workers
C: Cryolite workers
Answer: C: Cryolite workers 
Explanation: None