True about the anatomy of great saphenous vein:: (A) Stas as a continuation of medial marginal vein, (B) Ends of femoral vein 2.5 cm below the inguinal ligament, (C) There are 2 - 5 valves below the knee., (D) Ascends 2.5 - 3 cm behind tibial malleolus
Answer is A. A i.e. Stas as continuation- of medial marginal vein