This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Microbiology
Which of the following statement is true regarding RDA? 
Select and explain. 
A. RDA is statistically defined as two standard detion above the estimated average requirement (EAR), B. RDA is statistically defined as equal to the estimated average requirement, C. RDA is statistically defined as equal to the adequate intake, D. RDA is defined as the recommended minimum requirement
A: RDA is statistically defined as two standard detion above the estimated average requirement (EAR)
Answer: A: RDA is statistically defined as two standard detion above the estimated average requirement (EAR) 
Explanation: RDA (Recommended dietary allowance):Amount of nutrient estimated to meet the nutrient requirement of 97% to 98% of the healthy individual in an age and gender group.RDA = estimated average requirement +Two standard detion above the estimated average requirement .