<prompt> Commonest cause of rupture of spleen isChronic malariaInfectious mononucleosisLeukemiaChronic kala azar  <response>: spontaneous splenic rupture, which remain widely accepted to date: Mechanical effect of distention secondary to leukemic infiltration of the spleen, paicularly the capsule; splenic infarct with capsular hemorrhage and subsequent rupture; Ref Davidson edition23rd pg812 