Lic reund for plan jeevan dhara 145/10

One of my clients has received refund againt the LIC Jeevan Dhara Anuttiy Pension plan - 145/10. He has be paying 20000/- every year from 2001 for 10year i.e till 2010 and in the FY 2011-12 he has received the 100% matuiry amount.

So I would like to as wherter this sum is fully taxable or exempt.

Please tell me tax impication urgently required.

If possible give a soucre for your answer.