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.

[Q]: Though much of Enlightenment political thought was dominated by social contract theorists, both David Hume and Adam Ferguson criticized this camp. Hume's essay Of the Original Contract argues that governments derived from consent are rarely seen, and civil government is grounded in a ruler's habitual authority and force. It is precisely because of the ruler's authority over-and-against the subject, that the subject tacitly consents; Hume says that the subjects would "never imagine that their consent made him sovereign", rather the authority did so. Similarly, Ferguson did not believe citizens built the state, rather polities grew out of social development. In his 1767 An Essay on the History of Civil Society, Ferguson uses the four stages of progress, a theory that was very popular in Scotland at the time, to explain how humans advance from a hunting and gathering society to a commercial and civil society without "signing" a social contract.
[A]: In what work did Ferguson explain how humans advanced from a hunting and gathering society to a commercial and civil society without "signing" a social contract?


[Q]: Tower Control controls aircraft on the runway and in the controlled airspace immediately surrounding the airport. Tower controllers may use radar to locate an aircraft's position in three-dimensional space, or they may rely on pilot position reports and visual observation. They coordinate the sequencing of aircraft in the traffic pattern and direct aircraft on how to safely join and leave the circuit. Aircraft which are only passing through the airspace must also contact Tower Control in order to be sure that they remain clear of other traffic.
[A]: Who controls aircraft on the runway?


[Q]: The Royal Canadian Air Force (RCAF) is headed by the Commander of the Royal Canadian Air Force. The commander of 1 Canadian Air Division and Canadian NORAD Region, based in Winnipeg, is responsible for the operational command and control of Air Force activities throughout Canada and worldwide. 1 Canadian Air Division operations are carried out through eleven wings located across Canada. The commander of 2 Canadian Air Division is responsible for training and support functions. 2 Canadian Air Division operations are carried out at two wings. Wings represent the grouping of various squadrons, both operational and support, under a single tactical commander reporting to the operational commander and vary in size from several hundred personnel to several thousand.
[A]:
Who heads the Royal Canadian Air Force?