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: A flight from Los Angeles to Nashville is diverted to land in Las Vegas , Nevada when one of the passengers , Ralph Bundt becomes violent and attacks a stewardess .
Sent 2: Ralph had been bitten by a hamster Which is really a lab rat , brought onto the plane by Henry for his school students .
Sent 3: Ralph is restrained , but not before he bites the flight attendant Paula .
Sent 4: The plane is forced to make an emergency landing in Las Vegas , and once it has landed , air traffic control refuses to let it approach the gate .
Sent 5: Disobeying orders , Captain Forrest and his co-pilot Willsy find a jetway operated by a baggage handler Ed Ramirez .
Sent 6: Almost everyone evacuates the plane , except for the elderly couple Bev Stevens and her paralyzed mute husband Doc Stevens , and the pilots , who try to keep the violent Ralph contained in an aircraft bathroom .
Sent 7: However , they learn that they have been locked out of the airport .
Sent 8: Soon , armed soldiers and what appear to be CDC scientists surround the terminal .
Sent 9: One of the passengers , a military medic named Shilah Washington , reveals she has a medical kit in her bag in the plane's cargo hold .
Sent 10: The lead flight attendant Jenny , Henry , Ed , Nial Britz , and Preston sneak back into the plane to retrieve it .
Sent 11: They retrieve Shilah's kit and Nial's gun and they try to leave the hold .
Sent 12: While in the plane , Jenny is attacked by an infected Captain Forrest and Nial shoots and kills him , but it seems that some of the captain's blood had gotten into Nial's eye .
Question: People head back to the plane to get what? (A) Ice (B) Fuck (C) Gold (D) The medical kit (E) Sex (F) Fun.

Ex Output:
D.

Ex Input:
Paragraph- Sent 1: Fossils can be used to match up rock layers.
Sent 2: As organisms change over time, they look different.
Sent 3: Older fossils will look different than younger fossils.
Sent 4: Some organisms only survived for a short time before going extinct.
Sent 5: Knowing what organisms looked like at certain times also helps date rock layers.
Sent 6: Some fossils are better than others for this use.
Sent 7: The fossils that are very distinct at certain times of Earths history are called index fossils.
Sent 8: Index fossils are commonly used to match rock layers.
Sent 9: You can see how this works in Figure 2.30.
Sent 10: If two rock layers have the same index fossils, then they're probably about the same age.
Question: How are index fossils useful? (A) They show us flora of the past (B) Knowing what organisms looked like at certain times also helps date rock layers, and index fossils are the fossils that are very distinct at certain times of Earth's history (C) The fossils that are very distinct at certain times of Earths history and help date fossils (D) For fuel (E) They help to determineage of rock layers (F) They are used to mark water levels (G) They are used to identify extinct animals (H) As markers for glacier activity.

Ex Output:
B, C, E.

Ex Input:
Paragraph- Sent 1: Susan wanted to have a birthday party.
Sent 2: She called all of her friends.
Sent 3: She has five friends.
Sent 4: Her mom said that Susan can invite them all to the party.
Sent 5: Her first friend could not go to the party because she was sick.
Sent 6: Her second friend was going out of town.
Sent 7: Her third friend was not so sure if her parents would let her.
Sent 8: The fourth friend said maybe.
Sent 9: The fifth friend could go to the party for sure.
Sent 10: Susan was a little sad.
Sent 11: On the day of the party, all five friends showed up.
Sent 12: Each friend had a present for Susan.
Sent 13: Susan was happy and sent each friend a thank you card the next week.
Question: How many presents did Susan receive? (A) 5 (B) Five (C) 6 (D) More than 5.

Ex Output:
A, B.