<prompt> Translate the following text to EnglishKatika utangulizi wa sheria ya mpito, VA inasema wazi kuwa tarehe ya ufanisi wa sheria hiyo ni Novemba 25, 1991, tarehe ya uamuzi wa Mahakama ya Rufaa ya Veterans ambayo ilifutilia mbali kanuni za zamani.  <response>: In the preamble to the interim rule, VA clearly states that the effective date of the rule is November 25, 1991, the date of the Court of Veterans Appeals decision that invalidated the former regulations. 