Q: What is a question about this article? If the question is unanswerable, say "unanswerable".
Avoidance of triggers is a key component of improving control and preventing attacks. The most common triggers include allergens, smoke (tobacco and other), air pollution, non selective beta-blockers, and sulfite-containing foods. Cigarette smoking and second-hand smoke (passive smoke) may reduce the effectiveness of medications such as corticosteroids. Laws that limit smoking decrease the number of people hospitalized for asthma. Dust mite control measures, including air filtration, chemicals to kill mites, vacuuming, mattress covers and others methods had no effect on asthma symptoms. Overall, exercise is beneficial in people with stable asthma. Yoga could provide small improvements in quality of life and symptoms in people with asthma.
What is a main way people can prevent reactions to dust mites?
A: unanswerable

Q: What is a question about this article? If the question is unanswerable, say "unanswerable".
In October 2014, Beyonce signed a deal to launch an activewear line of clothing with British fashion retailer Topshop. The 50-50 venture is called Parkwood Topshop Athletic Ltd and is scheduled to launch its first dance, fitness and sports ranges in autumn 2015. The line will launch in April 2016.
What type of clothing does the British partnership with Beyonce sell?
A: activewear

Q: What is a question about this article? If the question is unanswerable, say "unanswerable".
The first BeiDou system, officially called the BeiDou Satellite Navigation Experimental System (simplified Chinese: ; traditional Chinese: ; pinyin: Beidou weixing daohang shiyan xitong) and also known as BeiDou-1, consists of three satellites and offers limited coverage and applications. It has been offering navigation services, mainly for customers in China and neighboring regions, since 2000.
What is another name for the BeiDou Satellite Navigation Experimental System?
A: BeiDou-1

Q: What is a question about this article? If the question is unanswerable, say "unanswerable".
Congress has the sole power to legislate for the United States. Under the nondelegation doctrine, Congress may not delegate its lawmaking responsibilities to any other agency. In this vein, the Supreme Court held in the 1998 case Clinton v. City of New York that Congress could not delegate a "line-item veto" to the President, by powers vested in the government by the Constitution.
In which year was the court case Clinton v. Supreme Court held?
A:
unanswerable