This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Fluid, Electrolyte and Nutrition, Subject name: Surgery
[{'content': 'What is the earliest sign of volume overload immediate after an operative procedure? \nSelect and explain. \nA. Weight gain, B. Increased Blood Pressure, C. Peripheral oedema, D. Distended neck veins', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Weight gain is the earliest sign of volume overload immediately after an operative procedure. It occurs most commonly due to excess of isotonic fluids because of overestimation of third-space losses or to ongoing GI losses which cannot be measured precisely. Volume overload can also present as: Increased cardiac output Increased central venous pressure Pulmonary edema Distended neck veins', 'role': 'assistant'}]