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
Average daily intake of fluoride from all sources combined for adults and children is: 
Select and explain. 
A. 2.0 to 2.2mg & 1.2mg, B. 1.2 to 2.0mg & 1.2mg, C. 2.2 to 2.4mg & 1.5mg, D. 2.6 to 2.8mg & 1.4mg
A: 2.0 to 2.2mg & 1.2mg
Answer: A: 2.0 to 2.2mg & 1.2mg 
Explanation: None