This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Testis and scrotum, Subject name: Surgery
What is the grade of given varicocele? 
Select and explain. 
A. Subclinical, B. Grade I, C. Grade II, D. Grade III
D: Grade III
Answer: D: Grade III 
Explanation: Varicocele Classification Subclinical Not palpable or visible at rest or during Valsalva maneuver, but demonstrable by special testsQ (reflux found on doppler examination) Grade 1 Palpable during ValsalvaQ maneuver, but not otherwise Grade 2 Palpable at restQ, but not visible Grade 3 VisibleQ and palpable at rest