This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Pre Anesthetic Evaluation, Subject name: Anaesthesia
[{'content': 'A patient with severe systemic disease which is a constant threat to the life belong to which ASA class:- \nSelect and explain. \nA. Class III, B. Class IV, C. Class V, D. Class VI', 'role': 'user'}, {'content': "Answer: B \nExplanation: ASA Grading and Predictive Moality ASA Grade Definition Moality % I Normal healthy individual 0.06 II Mild systemic disease that doesn't limit activity 0.4 III Severe systemic disease that limits activity 4.5 IV Severe systemic disease that is constant threat to life 23 V Moribund, not expected to survive 24 hrs with or without surgery 51 ASA grade Vl - comatose patient / brain dead patient for organ transplantation.", 'role': 'assistant'}]