<P> India's foreign exchange (Forex) reserve assets (FCA) stand at $377.751 billion, gold reserves at $20.691 billion, SDRs (Special Drawing Rights with the IMF) of $1.512 billion and $2.291 billion reserves in IMF leading to total Forex reserves of US $402.246 billion as on September 22, 2017, as per Reserve Bank of India's (RBI) weekly statistical supplement . The Economic survey of India 2014 - 15 said India could target foreign exchange reserves of US $750 billion - US $1 trillion . </P> <P> As of September 2017, India's foreign exchange reserves are mainly composed of US dollar in the forms of US government bonds and institutional bonds . with nearly 5% of forex reserves in gold . India is, coincidentally the world's largest gold consuming nation . The FCAs also include investments in US Treasury bonds, bonds of other selected governments and deposits with foreign central and commercial banks . India is at 8th position in List of countries by foreign - exchange reserves, just below Republic of China (Taiwan) and Russia . </P> <P> Reserve Bank of India Act and the Foreign Exchange Management Act, 1999 set the legal provisions for governing the foreign exchange reserves . Reserve Bank of India accumulates foreign currency reserves by purchasing from authorized dealers in open market operations . Foreign exchange reserves of India act as a cushion against rupee volatility once global interest rates start rising . </P> <P> The Foreign exchange reserves of India consists of below four categories; </P>

Which of the following is the biggest contributor of foreign exchange reserve of india