This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Pathology
[{'content': 'Best way to prevent hypotension during spinal anaesthesia \nSelect and explain. \nA. Preloading with crystalloids, B. Preloading with crystalloids, C. Mephentermine, D. Trendelenburg position', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Best method to prevent hypotension is to preload the patient with crystalloids or colloids. B, C, D are used as a pa of treatment not preventive measures. Prophylactic fluid preloading before spinal anesthesia has been a routine procedure to prevent maternal hypotension during cesarean delivery. Unlike colloid, timing of infusion of crystalloid may be impoant because of its sho stay in intravascular space Ref Robbins 9/e pg 765', 'role': 'assistant'}]