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: Physiology
[{'content': 'Most common cause of Cheyne-Stokes breathing is? \nSelect and explain. \nA. Diabetic ketoacidosis, B. CHF, C. Bulbar polio, D. Pontine hemorrhage', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is'b'i.e., CHF(Ref Clinicalmedicine p. 713)Cause of Cheyne-Stokes respiration,Normally occurs during sleep at high altitudeCongestive cardiac failureDamage to respiratory centers", 'role': 'assistant'}]