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
Most common cause of Cheyne-Stokes breathing is? 
Select and explain. 
A. Diabetic ketoacidosis, B. CHF, C. Bulbar polio, D. Pontine hemorrhage
B: CHF
Answer: B: CHF 
Explanation: 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