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': 'ASA -3 is \nSelect and explain. \nA. Comorbidities with minimal limitation, B. Comorbidities with moderate limitation, C. Comorbidities which are constant threat to life, D. No comorbidities', 'role': 'user'}, {'content': 'Answer: B \nExplanation: ASA grade 3 is when comorbidities are present and make patient symptomatic often.', 'role': 'assistant'}]