You are given a paragraph, a question and some answer options (associated with "A", "B", "C", "D", etc.) You need to list all the correct answer options with their associated letters (e.g. "A" can be a valid answer). Note that sometimes, more than one option can answer the question correctly and completely. In those cases, please generate all such options separated by a comma (e.g. "A, B" is a valid answer). Do not generate anything else apart from one or more of the following characters: 'A', 'B, 'C', 'D', etc.

Example Input: Paragraph- Sent 1: Right after the Pentagon was hit, NEADS learned of another possible hijacked aircraft.
Sent 2: It was an aircraft that in fact had not been hijacked at all.
Sent 3: After the second World Trade Center crash, Boston Center managers recognized that both aircraft were transcontinental 767 jetliners that had departed Logan Airport.
Sent 4: Remembering the "we have some planes" remark, Boston Center guessed that Delta 1989 might also be hijacked.
Sent 5: Boston Center called NEADS at 9:41 and identified Delta 1989, a 767 jet that had left Logan Airport for Las Vegas, as a possible hijack.
Sent 6: NEADS warned the FAA's Cleveland Center to watch Delta 1989.
Sent 7: The Command Center and FAA headquarters watched it too.
Sent 8: During the course of the morning, there were multiple erroneous reports of hijacked aircraft.
Sent 9: The report of American 11 heading south was the first; Delta 1989 was the second.
Sent 10: NEADS never lost track of Delta 1989, and even ordered fighter aircraft from Ohio and Michigan to intercept it.
Sent 11: The flight never turned off its transponder.
Sent 12: NEADS soon learned that the aircraft was not hijacked, and tracked Delta 1989 as it reversed course over Toledo, headed east, and landed in Cleveland.
Sent 13: But another aircraft was heading toward Washington, an aircraft about which NORAD had heard nothing: United 93.
Sent 14: United Airlines Flight 93 FAA Awareness.
Sent 15: At 9:27, after having been in the air for 45 minutes, United 93 acknowledged a transmission from the Cleveland Center controller.
Sent 16: This was the last normal contact the FAA had with the flight.
Sent 17: Less than a minute later, the Cleveland controller and the pilots of aircraft in the vicinity heard "a radio transmission of unintelligible sounds of possible screaming or a struggle from an unknown origin."Sent 18: The controller responded, seconds later: "Somebody call Cleveland?"This was followed by a second radio transmission, with sounds of screaming.
Question: Which air traffic center communicated with United 93? (A) Delta (B) Boston Center (C) Cleveland Center (D) Logan Airport (E) Cleveland Center controller (F) Cleveland.
Example Output: C, E, F.

Example Input: Paragraph- Sent 1: Lucy is an eight year old girl who lives with her parents and pet bird.
Sent 2: One Saturday afternoon, she sits at the kitchen table.
Sent 3: She draws a picture of her family.
Sent 4: She makes sure to draw her mom named Martha wearing a purple dress, because that is her favorite.
Sent 5: She draws many yellow feathers for her pet bird named Andy.
Sent 6: After she is done, she gives the picture to her mom.
Sent 7: Her mom hangs it up on the silver refrigerator.
Sent 8: The next day, Lucy's mom comes home with a brown dog named Oliver.
Sent 9: She tells Lucy that she is pet-sitting, which is like babysitting but with a friend's dog.
Sent 10: Lucy's mom tells her she can play with the dog as long as she takes good care of him.
Sent 11: Lucy is excited.
Sent 12: She pets Oliver nicely on his soft back.
Sent 13: He wags his tail.
Sent 14: He barks, "Woof!"Sent 15: and shows he wants to play fetch with her.
Sent 16: Lucy giggles and throws a ball for him to catch.
Sent 17: She wishes her bird could play like this with her every day!.
Question: What does Martha hang on a silver refrigerator? (A) A picture lucy drew (B) A photograph (C) Pictures of Lucy (D) Pictures Lucy draws (E) A picture.
Example Output: A, D, E.

Example Input: Paragraph- Sent 1: Breathing is the process of moving air into and out of the lungs.
Sent 2: The process depends on a muscle called the diaphragm.
Sent 3: This is a large, sheet-like muscle below the lungs.
Sent 4: Inhaling, or breathing in, occurs when the diaphragm muscle tightens.
Sent 5: This increases the size of the chest.
Sent 6: This too decreases air pressure inside the lungs.
Sent 7: This action allows air and gases to enter the lungs.
Sent 8: Exhaling, or breathing out, occurs when the diaphragm muscle relaxes.
Sent 9: This decreases the size of the chest.
Sent 10: This increases air pressure inside the lungs.
Sent 11: This action allows for air to leave the lungs.
Sent 12: When you inhale, air enters the respiratory system through your nose and ends up in your lungs, where gas exchange with the blood takes place.
Sent 13: What happens to the air along the way?
Sent 14: In the nose, mucus and hairs trap any dust or other particles in the air.
Sent 15: The air is also warmed and moistened.
Sent 16: Next, air passes through a passageway that is connected to the windpipe.
Sent 17: The air then finds its way to the lungs.
Sent 18: In the chest, the windpipe splits so that air enters both the right and left lung.
Question: Why inhaling increases size of chest (A) Due to decreases in air pressure inside the lungs (B) Due to increase in air pressure inside the lungs (C) Chest muscle tightens (D) Inhaling occurs when the diaphragm muscle tightens which increases size of chest (E) Diaphragm muscle tightens.
Example Output:
A, D, E.