Input: Read this: Some early male settlers married Indigenous American women and had informal unions with them. Early contact between Indigenous Americans and Europeans was often charged with tension, but also had moments of friendship, cooperation, and intimacy. Marriages took place in both English and Latin colonies between European men and Native women. For instance, on April 5, 1614, Pocahontas, a Powhatan woman in present-day Virginia, married the Englishman John Rolfe of Jamestown. Their son Thomas Rolfe was an ancestor to many descendants in First Families of Virginia. As a result, English laws did not exclude people with some Indigenous American ancestry from being considered English or white.
Question: When was John Rolfe divorced from Pocahontas?

Output: unanswerable


Input: Read this: While Knickebein was used by German crews en masse, X-Gerät use was limited to specially trained pathfinder crews. Special receivers were mounted in He 111s, with a radio mast on the bomber's fuselage. The system worked on a higher frequency (66–77 MHz, compared to Knickebein's 30–33 MHz). Transmitters on the ground sent pulses at a rate of 180 per minute. X-Gerät received and analysed the pulses, giving the pilot both visual and aural "on course" signals. Three beams intersected the beam along the He 111's flight path. The first cross-beam acted as a warning for the bomb-aimer to start the bombing-clock which he would activate only when the second cross-beam was reached. When the third cross-beam was reached the bomb aimer activated a third trigger, which stopped the first hand of the equipment's clock, with the second hand continuing. When the second hand re-aligned with the first, the bombs were released. The clock's timing mechanism was co-ordinated with the distances of the intersecting beams from the target so the target was directly below when the bomb release occurred.
Question: What mechanism cause the bombs to be released?

Output: clock's timing


Input: Read this: Bohemia (as Czech civilization was known by then) increased in power over the centuries, as its language did in regional importance. This growth was expedited during the fourteenth century by Holy Roman Emperor Charles IV, who founded Charles University in Prague in 1348. Here, early Czech literature (a biblical translation, hymns and hagiography) flourished. Old Czech texts, including poetry and cookbooks, were produced outside the university as well. Later in the century Jan Hus contributed significantly to the standardization of Czech orthography, advocated for widespread literacy among Czech commoners (particularly in religion) and made early efforts to model written Czech after the spoken language.
Question: In what city did Jan Hus found Charles University?

Output: unanswerable


Input: Read this: In English, the country is popularly known as either "Burma" or "Myanmar" i/ˈmjɑːnˌmɑːr/. Both these names are derived from the name of the majority Burmese Bamar ethnic group. Myanmar is considered to be the literary form of the name of the group, while Burma is derived from "Bamar", the colloquial form of the group's name. Depending on the register used, the pronunciation would be Bama (pronounced: [bəmà]) or Myamah (pronounced: [mjəmà]). The name Burma has been in use in English since the 18th century.
Question: Where did the name Burma originate from ?

Output:
names are derived from the name of the majority Burmese Bamar ethnic group