Tax exemption notification under section 10(23C)(iv) recognizes a charitable leprosy dispensary for specified assessment years. The Central Government notifies The Lakshmanjhula Leprosy Dispensary & Rehabilitation Centre as a recognized charitable medical institution for tax exemption under section 10(23C)(iv), invoking clause (iv) of sub-section (23C) of section 10 to confer eligibility for the assessment years specified in the notification.