Based on the information present in the given passage, you need to write a correct answer to the given question. A correct answer is one that correctly and completely answers the question. Do not write answers that address the question partially or incorrectly. The correct answer must be contained in the given paragraph.

[EX Q]: Paragraph- Sent 1: Imagine you are standing in a farm field in central Illinois.
Sent 2: The land is so flat you can see for miles and miles.
Sent 3: On a clear day, you might see a grain silo 20 miles away.
Sent 4: You might think to yourself, it sure is flat around here.
Sent 5: If you drive one hundred miles to the south, the landscape changes.
Sent 6: In southern Illinois, there are rolling hills.
Sent 7: Why do you think this is?
Sent 8: What could have caused these features?
Sent 9: There are no big rivers that may have eroded and deposited this material.
Sent 10: The ground is capable of supporting grass and trees, so wind erosion would not explain it.
Sent 11: To answer the question, you need to go back 12,000 years.
Sent 12: Around 12,000 years ago, a giant ice sheet covered much of the Midwest United States.
Sent 13: Springfield, Illinois, was covered by over a mile of ice.
Sent 14: Its hard to imagine a mile thick sheet of ice.
Sent 15: The massive ice sheet, called a glacier, caused the features on the land you see today.
Sent 16: Where did glaciers go?
Sent 17: Where can you see them today?
Sent 18: Glaciers are masses of flowing ice.
Question: In what part of Illinois might you be able to see a grain silo that is 20 miles away?.
[EX A]: Central Illinois.

[EX Q]: Paragraph- Sent 1: Electric charge is a physical property.
Sent 2: It occurs between particles or objects.
Sent 3: It causes them to attract or repel each other.
Sent 4: They do not even have to touch.
Sent 5: This is unlike the typical push or pull you may be familiar with.
Sent 6: All electric charge is based on the protons and electrons in atoms.
Sent 7: A proton has a positive electric charge.
Sent 8: An electron has a negative electric charge.
Sent 9: Forces on Charged Objects Most atoms are balanced electrically.
Sent 10: They have the same number of positive and negative charges.
Sent 11: Therefore, the number of protons equals the number of electrons.
Sent 12: Neutrons do not matter as they have no charge.
Sent 13: When an object loses some electrons, it becomes positively charged.
Sent 14: There are now more protons than electrons inside the atom.
Sent 15: The lost electrons may remain free.
Sent 16: Or, they may attach to another object.
Sent 17: The new object now has more electrons than protons.
Sent 18: It then becomes negatively charged.
Question: Why does an object's charge become positive?.
[EX A]: When an object loses electrons.

[EX Q]: Paragraph- Sent 1: (CNN) -- Cuba will pardon more than 2,900 prisoners, the government said Friday, though U.S. subcontractor Alan Gross is not among those who will be freed.
Sent 2: The decision to release the prisoners follows "numerous requests" from their family members and religious institutions, and is a humanitarian gesture, said Cuban President Raul Castro.
Sent 3: Among those who might be freed are prisoners over the age of 60, along with those who are sick, female or young with no previous criminal record.
Sent 4: With some exceptions, prisoners convicted of spying, terrorism, murder and drug trafficking will not be released.
Sent 5: Those who will be freed have already served a "important" part of their sentences and exhibited good behavior, according to an official statement published on the state-run website Cubadebate.
Sent 6: The jailed American, Gross, will not be among those pardoned, the Cuban Interests Section in Washington said.
Sent 7: Gross was jailed in December 2009, when he was working as a subcontractor on a U.S. Agency for International Development project aimed at spreading democracy.
Sent 8: Castro has accused him of importing satellite equipment to connect dissidents to the Internet, and this year Cuba's highest court upheld the 15-year sentence imposed on Gross for committing crimes against the security of the state.
Sent 9: He has maintained his innocence and said he was trying to help connect the Jewish community to the Internet.
Sent 10: Castro, speaking to the National Assembly, said that 86 prisoners from 25 countries would be among those released in coming days.
Sent 11: He cited the upcoming visit of Pope Benedict XVI as one of the motivations behind the move, which he said showed the "generosity and strength of the revolution."Sent 12: The pope has said he plans to visit Mexico and Cuba before Easter.
Question: Why is the decision to release 2900 Cuban prisoners considered by Cuban President Raul Castro a "humanitarian gesture"?.
[EX A]:
Most of the prisoners over the age of 60, along with those who are sick, female or young with no previous criminal record.