[Q]: Sentence: Some police forces use unmarked or minimally marked cars for traffic law enforcement, since drivers slow down at the sight of marked police vehicles and unmarked vehicles make it easier for officers to catch speeders and traffic violators. Question: What use of unmarked cars is controversial?
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[A]: yes

[Q]: Sentence: Everton agreed a long-term loan of 30 million with Bear Stearns and Prudential plc in 2002 over the duration of 25 years; a consolidation of debts at the time as well as a source of capital for new player acquisitions. Question: What is the Everton FC's overdraft with Barclays Bank secured against?
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[A]: no

[Q]: Sentence: Some will switch to other prey (with varying degrees of success) when the preferred target is extremely scarce, and they may also resort to scavenging or a herbivorous diet if possible.[citation needed] Question: What is the purpose of an evolutionary arms race?
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[A]:
no