Problem: Does "U.S. courts pioneered the concept of the opt-out class action, by which the burden falls on class members to notify the court that they do not wish to be bound by the judgment, as opposed to opt-in class actions, where class members must join into the class." answer the question "What is an opt-in class action?"

A: yes

Problem: Does "Despite competition from other materials, copper remains the preferred electrical conductor in nearly all categories of electrical wiring with the major exception being overhead electric power transmission where aluminium is often preferred." answer the question "What is the most important market for copper today?"

A: no

Problem: Does "In December 2005, activist Suzanne Shell filed suit demanding Internet Archive pay her US $100,000 for archiving her web site profane-justice.org between 1999 and 2004." answer the question "Who sued Internet Archive in 2005?"

A:
yes