Input: Article: Because it is normal to have bacterial colonization, it is difficult to know which chronic wounds are infected. Despite the huge number of wounds seen in clinical practice, there are limited quality data for evaluated symptoms and signs. A review of chronic wounds in the Journal of the American Medical Association's "Rational Clinical Examination Series" quantified the importance of increased pain as an indicator of infection. The review showed that the most useful finding is an increase in the level of pain [likelihood ratio (LR) range, 11-20] makes infection much more likely, but the absence of pain (negative likelihood ratio range, 0.64-0.88) does not rule out infection (summary LR 0.64-0.88).

Now answer this question: Why is it difficult to now which chronic wounds are infected?

Output: Because it is normal to have bacterial colonization

Input: Article: The competition formed as the FA Premier League on 20 February 1992 following the decision of clubs in the Football League First Division to break away from the Football League, which was originally founded in 1888, and take advantage of a lucrative television rights deal. The deal was worth 1 billion a year domestically as of 201314, with BSkyB and BT Group securing the domestic rights to broadcast 116 and 38 games respectively. The league generates 2.2 billion per year in domestic and international television rights. In 2014/15, teams were apportioned revenues of 1.6 billion.

Now answer this question: How much income does the Premier League generate per year in worldwide television rights?

Output: 2.2 billion

Input: Article: The early 1990s additionally saw the rise in mainstream US popularity for house music. Pop recording artist Madonna's 1990 single "Vogue" became an international hit single and topped the US charts. The single is credited as helping to bring house music to the US mainstream.

Now answer this question: who sang the hit single "vogue"?

Output:
Madonna