Given a document, find the main entity about whom the author is writing. Write the full name if mentioned in the text. Note that URLs in the text have been replaced with [Link].

[Q]: The leader of India's main opposition Congress party   Sonia Gandhi   has retired from  her  post  the party confirmed on Thursday.
 Her  son   Rahul Gandhi   has been elected unopposed as the new president and will officially take charge on Saturday.
 Mrs Gandhi   71  has been the party president since 1998.  She  was elected to parliament in 1999.
 She  is  however  not retiring from politics and will continue as a member of parliament  the party said.
 Mrs Gandhi  entered politics in 1994   three years after after  her  husband  former Prime Minister Rajiv Gandhi  was assassinated.
 Her  power derived from being the head of the Nehru-Gandhi dynasty  which has led the Congress party and has ruled India for most of the years since it became an independent nation in 1947.
After distancing  herself  from politics following  her  husband's death   Mrs Gandhi  was initially seen as a reluctant and almost reclusive politician.
Under  her  leadership  the party turned in its second-worst performance since independence in the 1999 elections  but won the general elections in 2004 and 2009.
Image copyright Getty Images Image caption  Rahul Gandhi  has been named the new Congress party president
Mrs Gandhi  an Italian-born Catholic  would have been the first foreigner to become Indian prime minister had  she  not surprised everyone by turning down the post after  her  general election success in 2004. Yet  many considered  her  the de facto head of the Congress government.
In recent years  Mrs Gandhi  has faced health issues. In 2011   she  had surgery in the US for an undisclosed medical condition and in 2013  she  was taken to hospital from parliament after falling ill.
[A]: Sonia Gandhi


[Q]: Kim Dae-Jung survived assassination attempts and a death sentence in his struggle against military-backed rulers  who had presided over dramatic economic growth but trampled human rights.
 Mass street protests led largely by Kim ushered in democracy in 1987.
 Democratisation "was possible because you were there with your unwavering convictions and your unyielding courage " Han said in his eulogy to Kim.
 Mourners pinned yellow ribbons to parliament's main gate. Thousands of police were deployed around the compound  where a large portrait of Kim  surrounded by flowers was placed on a shrine.
 Kim won office in 1997 at his fourth attempt  and was sworn in the following February at the height of the Asian financial crisis. He steered the country out of the crisis  launching major reforms and corporate restructuring.
 In 2000 he met Kim Jong-Il in Pyongyang for the first-ever summit in the hostile history of the two countries. His "sunshine" aid and engagement policy eased relations but failed to halt the North's nuclear weapons drive.
 Han said Kim "opened the path for inter-Korean reconciliation."
 Kim was awarded the Nobel prize for the summit and for his earlier struggle for democracy.
 The 2000 summit was marred by controversy after it emerged that Kim's government arranged for a business group to pay the North 500 million dollars as an inducement to hold it.
 But Kim never wavered on the need for reconciliation. "This is the best way to end the national tragedy and make a reunified motherland " he said in his final speech in office in 2003.
 "We will forever remember his wish for democracy and human rights as well as reconciliation and peace " the ruling Grand National Party said in a statement.
[A]: Kim Dae-Jung


[Q]: After a decade of rare stability in the region  Niger has in recent weeks been plunged into serious political crisis arising from Tandja's desire to extend his stay in power after his mandate expires this year.
 At the end of two five-year terms as elected head of state  Tandja  71  is due to leave office by December 22  but instead he has defied the country's top court and decided to hold a referendum on August 4 on a new constitution.
 The proposed constitution would enable him to hang on to power for three years and then to run for office again for unlimited terms.
 After defying the constitutional court Tandja assumed emergency powers which saw him dissolve the court as well as parliament and crack down on independent media.
Tandja  71  is due to leave office by December 22  but instead he has defied the country's top court and decided to hold a referendum on August 4 on a new constitution.
 After defying the constitutional court Tandja assumed emergency powers which saw him dissolve the court as well as parliament and crack down on independent media.
 The opposition has slammed Tandja's action as akin to a coup d'etat.
 ECOWAS is brandishing economic sanctions and diplomatic isolation if Tandja presses ahead with the referendum.
[A]:
Mamadou Tandja