This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Surgery
[{'content': 'Which of the following is better indicator of need for tranfusion - \nSelect and explain. \nA. Urine output, B. Haematorcrit, C. Colour of skin, D. Clinical examination', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Better indicator of need for transfusion\n\nIn case of chronic anemia → Haematocrit\nIn case of trauma → Clinical examination', 'role': 'assistant'}]