question:
Jayapala saw a danger in the consolidation of the Ghaznavids and invaded their capital city of Ghazni both in the reign of Sebuktigin and in that of his son Mahmud, which initiated the Muslim Ghaznavid and Hindu Shahi struggles.
What city did Jayapala invade at least twice?

answer: yes

question:
In 2000, 6265 percent of the population was estimated to have access to safe drinking water and only 69 percent to sanitation services of some kind.
In 2000 what percentage of the population had access to safe drinking water?

answer: yes

question:
On 9 March 2016, The Sun's front page proclaimed that Queen Elizabeth II was backing "Brexit", a common term for a British withdrawal from the European Union.
What is an often used term for British withdrawal from the European Union?

answer: yes

question:
While working class alumni of comprehensive schools were awarded better school diplomas at age 35, they held similar occupational positions as working class alumni of the tripartite system and were as unlikely to graduate from college.
Who conducted a study on comprehensive schools?

answer:
no