This task is about reading the given passage and construct a question about the information present in the passage. Construct a question in such a way that (i) it is unambiguous, (ii) it is answerable from the passage, (iii) its answer is unique (iv) its answer is a continuous text span from the paragraph. Avoid creating questions that (i) can be answered correctly without actually understanding the paragraph and (ii) uses same words or phrases given in the passage.

Example Input: The timing of migration seems to be controlled primarily by changes in day length. Migrating birds navigate using celestial cues from the sun and stars, the earth's magnetic field, and probably also mental maps.
Example Output: What causes the timing of migration?

Example Input: The inhabitants of the British Isles have been drinking ale since the Bronze Age, but it was with the arrival of the Roman Empire in its shores in the 1st Century, and the construction of the Roman road networks that the first inns, called tabernae, in which travellers could obtain refreshment began to appear. After the departure of Roman authority in the 5th Century and the fall of the Romano-British kingdoms, the Anglo-Saxons established alehouses that grew out of domestic dwellings, the Anglo-Saxon alewife would put a green bush up on a pole to let people know her brew was ready. These alehouses quickly evolved into meeting houses for the folk to socially congregate, gossip and arrange mutual help within their communities. Herein lies the origin of the modern public house, or "Pub" as it is colloquially called in England. They rapidly spread across the Kingdom, becoming so commonplace that in 965 King Edgar decreed that there should be no more than one alehouse per village.
Example Output: When did the inhabitants of the British Isles begin drinking ale?

Example Input: Christian missions established Western educational institutions in the Protectorates. Under Britain's policy of indirect rule and validation of Islamic tradition, the Crown did not encourage the operation of Christian missions in the northern, Islamic part of the country. Some children of the southern elite went to Great Britain to pursue higher education. By independence in 1960, regional differences in modern educational access were marked. The legacy, though less pronounced, continues to the present-day. Imbalances between North and South were expressed in Nigeria's political life as well. For instance, northern Nigeria did not outlaw slavery until 1936 whilst in other parts of Nigeria slavery was abolished soon after colonialism.
Example Output:
What religion built Western schools in Nigeria?