Problem: Umayyad Caliphate:

The rivalries between the Arab tribes had caused unrest in the provinces outside Syria, most notably in the Second Muslim Civil War of 680692 CE and the Berber Revolt of 740743 CE. During the Second Civil War, leadership of the Umayyad clan shifted from the Sufyanid branch of the family to the Marwanid branch. As the constant campaigning exhausted the resources and manpower of the state, the Umayyads, weakened by the Third Muslim Civil War of 744747 CE, were finally toppled by the Abbasid Revolution in 750 CE/132 AH. A branch of the family fled across North Africa to Al-Andalus, where they established the Caliphate of Cordoba, which lasted until 1031 before falling due to the Fitna of al-Andalus.

In what years did the First Muslim Civil War occur?
---
A: unanswerable

Problem: Steven Spielberg:

As a result, they broke up in 1979, but remained close friends. Then in 1984 they renewed their romance, and in November 1985, they married, already having had a son, Max Samuel. After three and a half years of marriage, however, many of the same competing stresses of their careers caused them to divorce in 1989. They agreed to maintain homes near each other as to facilitate the shared custody and parenting of their son.:403 Their divorce was recorded as the third most costly celebrity divorce in history.

How expensive was Spielberg and Irving's divorce?
---
A: third most costly celebrity divorce in history

Problem: Film speed:

Digital cameras have far surpassed film in terms of sensitivity to light, with ISO equivalent speeds of up to 409,600, a number that is unfathomable in the realm of conventional film photography. Faster processors, as well as advances in software noise reduction techniques allow this type of processing to be executed the moment the photo is captured, allowing photographers to store images that have a higher level of refinement and would have been prohibitively time consuming to process with earlier generations of digital camera hardware.

How has film surpassed digital cameras?
---
A: unanswerable

Problem: Pope John XXIII:

On 25 May 1963, the pope suffered another haemorrhage and required several blood transfusions, but the cancer had perforated the stomach wall and peritonitis soon set in. The doctors conferred in a decision regarding this matter and John XXIII's aide Loris F. Capovilla broke the news to him saying that the cancer had done its work and nothing could be done for him. Around this time, his remaining siblings arrived to be with him. By 31 May, it had become clear that the cancer had overcome the resistance of John XXIII it had left him confined to his bed.

When was it clear that the cancer had overcome the resistance of John XXIII?
---
A:
31 May