Solution:

• Manmohan Singh is an Indian economist, academic, and politician who served as the 13th Prime Minister of India from 2004 to 2014. The first Sikh in office, Singh was also the first prime minister since Jawaharlal Nehru to be re-elected after completing a full five-year term.

• Singh was first elected to the upper house of Parliament, the Rajya Sabha, in 1991 by the legislature of the state of Assam, and was re-elected in 1995, 2001, 2007 and 2013. From 1998 to 2004, while the Bharatiya Janata Party was in power, Singh was the Leader of the Opposition in the Rajya Sabha. In 1999, he contested for the Lok Sabha from South Delhi but was unable to win the seat.