This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Trauma, Subject name: Surgery
[{'content': "Patient with massive hemorrhage presents to the ER after A. What's not to be done? \nSelect and explain. \nA. Massive transfusion of fluid challenge, B. IV crystalloid 2L, within few minutes, C. Early tranexamic acid recommended, D. Check coagulation with thromboelastography, if available", 'role': 'user'}, {'content': 'Answer: B \nExplanation: - ATLS updates (2018): Give only 1 liter of warm isotonic crystalloids for adults (old edition recommended 1-2 liters of warm crystalloid solution) - ATLS updates (2018): In children <40kg, give 20ml/kg of warm isotonic crystalloids The initial resucitation with crystalloid fluid still begins with a 1 litre bolus of warmed isotonic fluid.Early control of external hemorrhage is pivotal to the management of the injured patient. Thromboelastography and rotational thromboelastometry are helpful when available to pinpoint the precise ocagulation deficiency." CRASH-2 Trial (ATLS updates 2018 ) - Use of tranexamic acid in hypotensive trauma patients', 'role': 'assistant'}]