Specification under Section 35AC extends tax-exempt status for a medical trust's rural outreach health scheme. The Central Government, invoking the Explanation to Section 35AC, specifies the Shri Kanchi Kamakoti Medical Trust's Vision-Phase-II Rural Outreach Eye Care Programme and related hospital additions and quarters as an eligible project for gifts/donations; the National Committee recommended, and the Government granted, a three-year extension of the original three-year specification to commence from the assessment year 1998-99, thereby extending the period in which gifts to that specified scheme qualify for the statutory exemption.