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
Most reliable test for screening of diabetes mellitus- 
Select and explain. 
A. Random sugar, B. Fasting sugar, C. Glucose tolerance test, D. Urine sugar
B: Fasting sugar
Answer: B: Fasting sugar 
Explanation: "The best screening test for diabetes, the fasting plasma glucose (FPG), is also a component of diagnostic testing" ___ diabetesjournals.org

The fasting plasma glucose test and the 75g oral glucose tolerance test (GTT) are both suitable tests for screening of diabetes.
However, the FPG test is preferred in clinical settings because it is easier and faster to perform, more convenient and acceptable to patients, and less expensive.

"Fasting plasma glucose level is the most reliable and convenient test" Problem oriented patient management