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: Social & Preventive Medicine
Confirmed case of fluorosis is defined by presence of fluoride in urine more than: 
Select and explain. 
A. 1 mg/L, B. 3 mg/L, C. 5 mg/L, D. 7 mg/L
A: 1 mg/L
Answer: A: 1 mg/L 
Explanation: Confirmed case of fluorosis is defined as presence of one or both of the following: High level of fluoride in urine >1mg/L Intraosseous membrane calcification in fore arm confirmed by Xray Ref: Health policies and programmes in India, D.K. Taneja 11th edition page: 329