<prompt> Which of the following disease is NOT liable for extended sickness benefit for 309 days -LeprosyAplastic anemiaImmature cataract with vision 660 or lessMental disease  <response>: Extended sickness benefit is for a duration of 2 years. It include 34 diseases.Aplastic anemia is not applicable for extended sickness benefitREF. PARK;S TEXTBOOK OF PREVENTIVE AND SOCIAL MEDICAL 21ST EDITION. PAGE NO - 757 