Best Interest rate on Fixed Deposit Account

Please could some one advise what is the top Bank or Co-operative Society or an Financial Institution etc offering best rate of return on a lump sum for a period of 10 years.

I am planning to fix an amount of 85 lacs for a long period with the possibility of recurring interest getting compounded.

PS: I am not interested in index or equity linked instruments as I am strictly interested in risk free or say minimum risk (even Banks or a country can go bankrupt :)

Thanks

Best Interest rate on Fixed Deposit Account