Context: In the beginning of 1996, several human rights groups brought cases to hold Shell accountable for alleged human rights violations in Nigeria, including summary execution, crimes against humanity, torture, inhumane treatment and arbitrary arrest and detention. In particular, Shell stood accused of collaborating in the execution of Ken Saro-Wiwa and eight other leaders of the Ogoni tribe of southern Nigeria, who were hanged in 1995 by Nigeria's then military rulers. The lawsuits were brought against Royal Dutch Shell and Brian Anderson, the head of its Nigerian operation. In 2009, Shell agreed to pay $15.5m in a legal settlement. Shell has not accepted any liability over the allegations against it.

Question: In 1996, multiple groups filed lawsuits to hold Shell accountable for what?
Answer: alleged human rights violations in Nigeria

Question: Shell was accused of participating in the execution of which southern Nigerian tribal leader?
Answer: Ken Saro-Wiwa

Question: In what year did Shell agree to settle the lawsuits filed in 1996?
Answer: 2009

Question: For what amount did Shell agree to settle the 1996 lawsuits?
Answer: $15.5m

Question: In contrast to its agreement to settle the 1996 lawsuits, Shell refused to do what?
Answer: accepted any liability over the allegations against it

Question: When was Brian Anderson hanged?
Answer: Unanswerable

Question: Brian Anderson was the leader of what tribe?
Answer: Unanswerable

Question: What was Ken Saro-Wiwa accused of?
Answer: Unanswerable

Question: How much did Shell pay to the Ogoni tribe?
Answer: Unanswerable

Question: When did Shell sue Nigeria?
Answer: Unanswerable