The following are stories and questions about them. Each story is followed by a question and answer to a given question.

Story: (CNN) -- One of four former Khmer Rouge leaders charged with crimes against humanity was ruled unfit to stand trial and could be set free, a spokesman for the special U.N. court in Cambodia said Thursday. 

Lars Olsen said the Extraordinary Chambers in the Courts of Cambodia decided that Ieng Thirith, the 78-year-old former minister of social affairs in the Khmer Rouge regime, was "not fit to stand trial as she has dementia." 

Prosecutors have 24 hours to object to the court's decision, Olsen said. If there is no objection, Ieng Thirith will be released, he added. 

Opening statements by the defendants are scheduled for Monday. 

Ieng Thirith was the only woman among the four defendants in the trial, which charges surviving leaders of the four-year Khmer Rouge regime in the 1970s with crimes against humanity, grave breaches of the Geneva Conventions, genocide, homicide, torture and religious persecution. 

The other defendants are her husband, Ieng Sary, the former Khmer Rouge foreign minister; Khieu Samphon, the nominal head of state; and Nuon Chea, the prime minister, also known as Brother Number 2. 

The head of the Khmer Rouge, Pol Pot, was known as Brother Number 1. He died in 1998, long before the U.N.-backed court came into existence. 

Under Pol Pot's leadership, the Khmer Rouge regime was responsible for the deaths of millions of ordinary Cambodians during a four-year reign of terror that was eventually halted in 1979 by invading Vietnamese forces. 

In 1975, the Khmer Rouge ordered people out of Phnom Penh, the capital, and other cities in Cambodia to work in the countryside. 

Question: Who is Lars Olsen?
Answer:A spokesman for the special U.N. court

Question: Who is leng Thirith?
Answer:Former minister of social affairs in the Khmer Rouge regime

Question: How old is she?
Answer:78

Question: What did Lars Olsen say about her?
Answer:She was "not fit to stand trial as she has dementia."

Question: Has she been charged with crimes?
Answer:Yes

Question: Does she have co-defendents?
Answer:Yes

Question: Who are they?
Answer:Ieng Sary, Khieu Samphon, and Nuon Chea

Question: Name one of the crimes they are charged with?
Answer:Crimes against humanity

Question: And another?
Answer:Grave breaches of the Geneva Conventions

Question: What country did these things happen in?
Answer:Cambodia

Question: What is its capital?
Answer:Phnom Penh

Question: Which faction or group were the defendents part of ?
Answer:Khmer Rouge

Question: How long did it last?
Answer:Four years

Question: When did it end?
Answer:1979

Question: Who was its head?
Answer:Pol Pot

Question: What other name was he known by?
Answer:Brother Number 1

Question: Who was Brother Number 2?
Answer:Nuon Chea

Question: What did the Khmer Rouge do in 1975?
Answer:Ordered people to work in the countryside.

Question: How many Cambodians died?
Answer:Millions

Question: Is brother no 2 one of the defendents?
Answer:
Yes