Question: Who is the President of Hassan Muhammed Gusau's country?

full_context: Document 1: Abubakar Mahdi: Abubakar Mahdi was elected Senator for the Borno South constituency of Borno State, Nigeria at the start of the Nigerian Fourth Republic, running on the People's Democratic Party (PDP) platform. He took office on 29 May 1999.
Document 2: Nigeria: The vast majority of Muslims in Nigeria are Sunni belonging to Maliki school of jurisprudence; however, a sizeable minority also belongs to Shafi madhhab. A large number of Sunni Muslims are members of Sufi brotherhoods. Most Sufis follow the Qadiriyya, Tijaniyyah and/or the Mouride movements. A significant Shia minority exists (see Shia in Nigeria). Some northern states have incorporated Sharia law into their previously secular legal systems, which has brought about some controversy. Kano State has sought to incorporate Sharia law into its constitution. The majority of Quranists follow the Kalo Kato or Quraniyyun movement. There are also Ahmadiyya and Mahdiyya minorities.
Document 3: Isa Yuguda: Mallam Isa Yuguda was elected Governor of Bauchi State, Nigeria in April 2007 on the All Nigeria Peoples Party (ANPP) platform.
Document 4: Nigeria: Since 2002, the North East of the country has seen sectarian violence by Boko Haram, an Islamist movement that seeks to abolish the secular system of government and establish Sharia law. Nigerian President Goodluck Jonathan in May 2014 claimed that Boko Haram attacks have left at least 12,000 people dead and 8,000 people crippled. At the same time, neighbouring countries, Benin, Chad, Cameroon and Niger joined Nigeria in a united effort to combat Boko Haram in the aftermath of a world media highlighted kidnapping of 276 schoolgirls and the spread of Boko Haram attacks to these countries.
Document 5: Nayyar Hussain Bukhari: Nayyar Hussain Bukhari (), is the senior senator from Islamabad and senior leader of the Pakistan Peoples Party (PPP). He was the 6th Chairman of the Senate of Pakistan, serving from 12 March 2012 to 12 March 2015.
Document 6: 2018 Ouagadougou attacks: In the aftermath of the 2011 Libyan Civil War, militant attacks have increased due to a large influx of weapons and fighters into the region. Neighbouring Mali faced conflict in Azawad that threatened to split the country. Since 2015, Burkina Faso has faced cross-border attacks and sporadic raids in its territory, the result of instability and unrest in neighboring countries. Two major attacks have occurred in the capital Ouagadougou in recent years: In 2016, attacks on a hotel and restaurant killed 30 people, including foreigners; and in 2017, similar attacks killed 19 people, including foreigners. Both of these attacks were carried out by Al-Qaeda in the Islamic Maghreb.Burkina Faso also faced an uprising in 2014 leading to the downfall of President Blaise Compaoré later that year. Burkina Faso is a member of the Trans-Saharan Counterterrorism Partnership and its commitment of peacekeeping troops in Mali and Sudan has made it a target for extremists in the region.
Document 7: Nigeria: Ethnocentrism, tribalism, religious persecution, and prebendalism have affected Nigerian politics both prior and subsequent to independence in 1960. Kin-selective altruism has made its way into Nigerian politics, resulting in tribalist efforts to concentrate Federal power to a particular region of their interests. Nationalism has also led to active secessionist movements such as MASSOB, Nationalist movements such as Oodua Peoples Congress, Movement for the Emancipation of the Niger Delta and a civil war. Nigeria's three largest ethnic groups (Hausa, Igbo and Yoruba) have maintained historical preeminence in Nigerian politics; competition amongst these three groups has fuelled corruption and graft.
Document 8: Zainab Abdulkadir Kure: Hajiya Zainab Abdulkadir Kure (born 24 November 1959) was elected Senator for the Niger South constituency of Niger State, Nigeria, taking office on 29 May 2007. She is a member of the People's Democratic Party (PDP).
Document 9: Nigeria: Nigeria is a religiously diverse society, with Islam and Christianity being the most widely professed religions. Nigerians are nearly equally divided into Christians and Muslims, with a tiny minority of adherents of Animism and other religions. According to one recent estimate, over 40% of Nigeria's population adheres to Islam (mainly Sunni, other branches are also present). Christianity is practised by 58% of the population (among them 74% are Protestant, 25% Roman Catholic, 1% other Christian). Adherents of Animism and other religions collectively represent 1.4% of the population.
Document 10: Patrick Aga: Patrick Aga was elected Senator for the Nasarawa North constituency of Nasarawa State, Nigeria at the start of the Nigerian Fourth Republic, running on the People's Democratic Party (PDP) platform. He took office on 29 May 1999.
Document 11: Islamism: Originating as the Jama'at al-Tawhid wal-Jihad in 1999, it pledged allegiance to al-Qaeda in 2004, participated in the Iraqi insurgency that followed the March 2003 invasion of Iraq by Western forces, joined the fight in the Syrian Civil War beginning in March 2011, and was expelled from al-Qaeda in early 2014, (which complained of its failure to consult and "notorious intransigence"). The group gained prominence after it drove Iraqi government forces out of key cities in western Iraq in a 2014 offensive. The group is adept at social media, posting Internet videos of beheadings of soldiers, civilians, journalists and aid workers, and is known for its destruction of cultural heritage sites. The United Nations has held ISIL responsible for human rights abuses and war crimes, and Amnesty International has reported ethnic cleansing by the group on a "historic scale". The group has been designated a terrorist organisation by the United Nations, the European Union and member states, the United States, India, Indonesia, Turkey, Saudi Arabia, Syria and other countries.
Document 12: Nigeria: According to a 2001 report from The World Factbook by CIA, about 50% of Nigeria's population is Muslim, 40% are Christians and 10% adhere to local religions. But in some recent report, the Christian population is now sightly larger than the Muslim population. An 18 December 2012 report on religion and public life by the Pew Research Center stated that in 2010, 49.3 percent of Nigeria's population was Christian, 48.8 percent was Muslim, and 1.9 percent were followers of indigenous and other religions, or unaffiliated. Additionally, the 2010s census of Association of Religion Data Archives has reported that 46.5 percent of the total population is Christian, slightly bigger than the Muslim population of 45.5 percent, and that 7.7 percent are members of other religious groups.
Document 13: Allahshukur Pashazadeh: Finally returning to Azerbaijan in 1975, he became the acting secretary of the Caucasian Muslims Office, and Akhund and deputy chief of the Taza Pir Mosque in the Azerbaijani capital Baku. In 1980 he was elected chairman of the Caucasian Muslims Office and became Sheikh ul-Islam. After the collapse and dissolution of the Soviet Union and independence of Azerbaijan, in 1992, he was elected chairman of the Supreme Religious Board of Caucasian peoples of Azerbaijan, Georgia, Dagestan, Kabardino-Balkaria, Ingushetia, Chechnya, Karachay-Cherkessia, and Adygea.
Document 14: Hassan Muhammed Gusau: Hassan Muhammed Gusau, or Hassan Nasiha (born 12 December 1960) was elected Senator for the Zamfara Central constituency of Zamfara State, Nigeria, taking office on 29 May 2007. He is a member of the All Nigeria Peoples Party (ANPP) and the current PDP chairman zamfara state also a member PDP board of trustees .
Document 15: Abdurrahman Shugaba Darman: Alhaji Abdurrahman Shugaba Darman (1920–2010) was a Nigerian politician from Borno State, and a contemporary of the late Sir Ahmadu Bello. Shugaba Darman was a founding member of the Great Nigeria People's Party and was elected as a member of the Borno State House of Assembly in 1979 where he also became the house Majority Leader.
ground_truth: Goodluck Jonathan
sub_queries: Of what country is Hassan Muhammed Gusau a citizen? Answer: Nigeria
Who is the President of Nigeria ? Answer: Goodluck Jonathan