<prompt> Cause of central cyanosis include all the following exceptChronic asthmaCongestive pulmonary stenosisCongestive hea failureAlveolar hypotension  <response>: CHF is a cause for peripheral cyanosis and not central cyanosis. Cyanosis when present in asthma,pulmonic stenosis and alveolar hypoventilation is of central type. Ref Harrison 19th edition pg 249 