Fluid overload during TURP (Transurethral Resection of Prostate) is typically due to:

Correct option is A

During TURP, large volumes of hypotonic irrigation fluid (glycine, water) may be absorbed into circulation, leading to TURP syndrome: hyponatremia, confusion, pulmonary edema.
Explanation of options: (a) ✔ Correct; irrigation fluid absorption is the main cause of intraoperative fluid overload in TURP. (b) ✘ Overtransfusion causes circulatory overload but is not classic TURP complication. (c) ✘ Hypertonic saline causes hypernatremia, not overload with dilutional hyponatremia. (d) ✘ IV crystalloids may add volume but not the main mechanism of TURP overload.