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
How much fluoride is present in a tooth paste with 700 ppm fluoride? 
Select and explain. 
A. 0.7 mg per one gram of toothpaste, B. 7 mg per one gram of tooth paste, C. 7.2 mg per one gram of toothpaste, D. 0.007 mg per one gram of toothpaste
A: 0.7 mg per one gram of toothpaste
Answer: A: 0.7 mg per one gram of toothpaste 
Explanation: None