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: Ophthalmology
The ETDRS cha is used for visual evaluation in diabetic patients. What does ETDRS stand for 
Select and explain. 
A. Extended treatment for diabetic retinopathy study, B. Early treatment for diabetic retinopathy study, C. Emergency treatment for diabetic retinopathy study, D. Emerging treatment for diabetic retinopathy study
B: Early treatment for diabetic retinopathy study
Answer: B: Early treatment for diabetic retinopathy study 
Explanation: Answer: B. Early treatment for diabetic retinopathy studyETDRS stands for Early treatment for diabetic retinopathy study