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: Anaesthesia
[{'content': 'A 65 year old man with history of myocardial infarction is posted for elective cholecystectomy. His weight is 73 kg and height is 6’2 feet. His Packed cell volume is 35. What is the maximal allowable blood loss for the procedure \nSelect and explain. \nA. 600ml, B. 680ml, C. 700ml, D. 780ml', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]