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.

Ex Input:
Paragraph- Sent 1: Static electricity is like a teeter-totter.
Sent 2: What happens if a teeter-totter is balanced?
Sent 3: Correct!
Sent 4: It does not move.
Sent 5: What about when its not balanced?
Sent 6: Yes, it will now begin to move.
Sent 7: Charges move when they are not balanced.
Sent 8: Charges can build up by friction.
Sent 9: Maybe you rub your feet on a wool mat or carpet.
Sent 10: Rubber soled shoes readily gain charges.
Sent 11: The wool carpet easily gives up charges.
Sent 12: The two items become unbalanced.
Sent 13: One item has a positive charge.
Sent 14: The other has a negative charge.
Sent 15: The difference in charge is called static electricity.
Sent 16: Just like the teeter-totter, something is going to move.
Sent 17: Positive charges build up on the mat.
Sent 18: Negative charges build up on you.
Question: What two types of charges build up in unbalanced items? (A) Outside charges (B) Neutral (C) Negative Charge and Positive Charge (D) Good charges (E) Positive and negative (F) Negative (G) Static Charge (H) Negative charges (I) Bad Charges (J) Positive.

Ex Output:
C, E.

Ex Input:
Paragraph- Sent 1: If you build a campfire, you start with a large stack of sticks and logs.
Sent 2: As the fire burns, the stack slowly shrinks.
Sent 3: By the end of the evening, all that is left is a small pile of ashes.
Sent 4: What happened to the matter that you started with?
Sent 5: Was it destroyed by the flames?
Sent 6: It may seem that way.
Sent 7: What do you think happened?
Sent 8: The truth is that the same amount of matter still exists.
Sent 9: The wood changed not only to ashes, but also to carbon dioxide, water vapor, and other gases.
Sent 10: The gases floated off into the air, leaving behind just the ashes.
Sent 11: Although matter was changed, it was not created or destroyed.
Sent 12: Because the same amount of matter still exists, we can say that matter is conserved.
Sent 13: You may wonder how it can be conserved if something is now missing?
Sent 14: Assume you had measured the mass of the wood before you burned it.
Sent 15: Assume you had also trapped the gases released by the burning wood and measured their mass and the mass of the ashes.
Sent 16: What would you find?
Sent 17: The ashes and gases combined have the same mass as the wood you started with.
Sent 18: This example illustrates the law of conservation of mass.
Question: What happened to the matter changed to when burning a fire? (A) The wood changed to carbon dioxide, water vapor, and other gases that floated off into the air, leaving behind just the ashes (B) It changed to other gases (C) It changed to ashes (D) It changed to Carbon dioxide (E) It changed to water vapor (F) It was destroyed (G) More matter was created (H) All the matter changes to fire.

Ex Output:
A, B, C, D, E.

Ex Input:
Paragraph- Sent 1: Radio Televizioni Shqiptar (RTSH) is the public radio and TV broadcaster of Albania, founded by King Zog in 1938.
Sent 2: RTSH runs three analogue television stations as TVSH Televizioni Shqiptar, four digital thematic stations as RTSH, and three radio stations using the name Radio Tirana.
Sent 3: In addition, 4 regional radio stations serve in the four extremities of Albania.
Sent 4: The international service broadcasts radio programmes in Albanian and seven other languages via medium wave (AM) and short wave (SW).
Sent 5: The international service has used the theme from the song "Keputa nje gjethe dafine" as its signature tune.
Sent 6: The international television service via satellite was launched since 1993 and aims at Albanian communities in Kosovo, Serbia, Macedonia, Montenegro and northern Greece, plus the Albanian diaspora in the rest of Europe.
Sent 7: RTSH has a past of being heavily influenced by the ruling party in its reporting, whether that party be left or right wing.
Sent 8: According to the Albanian Media Authority, AMA, Albania has an estimated 257 media outlets, including 66 radio stations and 67 television stations, with three national, 62 local and more than 50 cable TV stations.
Sent 9: Last years Albania has organized several shows as a part of worldwide series like Dancing with the Stars, Big Brother Albania, Albanians Got Talent, The Voice of Albania, and X Factor Albania.
Question: How many radio stations does RSTH host in total (local and regional)? (A) 67 (B) 66 (C) 50 (D) Sixty Six (E) 7.

Ex Output:
B, D, E.