State of Tamil Nadu & Others,[1996] 3 SCC 15 1996 Indlaw SC 858,which was a case relating to Medical Education and which also related to the effect of a Central Law upon a law made by the State under Entry 25 List III,it was held that the "essentiality certificate cannot be withheld by the State Government on any policy consideration because the policy in the matter of establishment of a new medical college now vests with the Central Government alone