A study is conducted to evaluate the action of a new oral antidiabetic drug in patients with a new onset type 2 diabetes. All patients involved in the study are informed that they would be treated with a new oral antidiabetic drug. They are divided into three groups and each group would be treated with a different dose. Drug assessment is determined based on testing serum glucose and HgA1C regularly throughout the study.
Which of the following best describes this type of study?
A-Case-control study
B-Randomized controlled trial
C-Single blind clinical trial
D-Double blind clinical trial
E-Cross sectional study