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: Medicine
Cause of central cyanosis include all of the following, Except 
Select and explain. 
A. Chronic Asthma, B. Congenital Pulmonary stenosis, C. Congestive hea failure, D. Alveolar hypoventilation
C: Congestive hea failure
Answer: C: Congestive hea failure 
Explanation: Answer is C (Congestive hea failure): Congestive Hea Failure is a cause for Peripheral cyanosis and not central cyanosis Cyanosis when present in Asthma, pulmonic stenosis and alveolar hypoventilation is of the central type.