This task is about creating an unanswerable question based on a given passage. Construct a question that looks relevant to the given context but is unanswerable. Following are a few suggestions about how to create unanswerable questions:
(i) create questions which require satisfying a constraint that is not mentioned in the passage
(ii) create questions which require information beyond what is provided in the passage in order to answer
(iii) replace an existing entity, number, date mentioned in the passage with other entity, number, date and use it in the question
(iv) create a question which is answerable from the passage and then replace one or two words by their antonyms or insert/remove negation words to make it unanswerable.

Passage: The Constitution of Canada gives the federal government exclusive responsibility for national defence, and expenditures are thus outlined in the federal budget. For the 20082009 fiscal year, the amount allocated for defence spending was CAD$18.9 billion. This regular funding was augmented in 2005 with an additional CAD$12.5 billion over five years, as well as a commitment to increasing regular force troop levels by 5,000 persons, and the primary reserve by 3,000 over the same period. In 2006, a further CAD$5.3 billion over five years was provided to allow for 13,000 more regular force members, and 10,000 more primary reserve personnel, as well as CAD$17.1 billion for the purchase of new trucks for the Canadian Army, transport aircraft and helicopters for the Royal Canadian Air Force, and joint support ships for the Royal Canadian Navy.
What gives the federal government responsibility for international defense?