<prompt> Pneumonia is a complication of:MeaslesChickenpoxInfectious mononucleosisMastoiditis  <response>: Ans. A. MeaslesImportant complications of measles include immunosuppression, Pneumonia, laryngitis, tracheitis, bronchitis, and flaring of mycobacterium tuberculosis infection. Gastrointestinal complications include diarrhea, appendicitis, hepatitis, and ileocolitis. 