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 group of researchers at a remote jungle island outpost discover the natives are practicing voodoo and black magic .
Sent 2: After killing the local priest , a voodoo curse begins to raise the dead to feed on the living in retribution .
Sent 3: The researchers on the island are killed by the newly risen zombies , except for Jenny , the daughter of a scientist couple .
Sent 4: She escapes , protected by an enchanted necklace charm given to her by her mother shortly before her death .
Sent 5: She returns years later as an adult with a group of mercenaries to attempt to uncover what happened to her parents .
Sent 6: Shortly after arriving at the island their boat 's engine dies , stranding them .
Sent 7: Meanwhile elsewhere on the island a trio of hikers discover a cave , the same cave leading to the underground temple where the original curse was created .
Sent 8: After accidentally reviving the curse , the dead once again return to kill any who trespass on their island .
Sent 9: The mercenaries encounter their first zombie , who injures a member of the team .
Sent 10: Taking shelter in the remains of the old research facilities medical quarters they are soon joined by Chuck , the only surviving hiker .
Sent 11: Arming themselves with weapons left behind by the long dead research team , they make their stand as the dead once again rise .
Sent 12: One by one they are injured or killed , one of whom sacrifices himself to blow up the medical facility and his newly undead team members .
Sent 13: Jenny and Chuck flee , the only survivors remaining .
Sent 14: They stumble upon the cave once again , where the zombies appear and attack .
Question: Who kills the local priest? (A) A group of researchers (B) The researchers (C) The natives.

Ex Output:
A, B.

Ex Input:
Paragraph- Sent 1: One evening , Felix serves as a conductor to four singing cats .
Sent 2: Meanwhile at a house only a few yards away , a hefty man is napping on a chair but gets awakened by their act .
Sent 3: To silence them , the man grabs and rolls out bowling ball , knocking Felix and the other cats off their feet .
Sent 4: Felix , however , still insist to go on performing as he plays a flute and his friends dance .
Sent 5: Awakened once more , the man takes out an ether sprayer and showers its contents onto the cats .
Sent 6: While his friends fall into a snooze , Felix decides to have his sleep at home .
Sent 7: Felix enters his apartment , and lies on the sofa .
Sent 8: But before he can rest long enough , his dwarf master calls him over .
Sent 9: Felix comes in and hears about the dwarf's complaint about an insomnia problem .
Sent 10: To assist his master , the cat offers a glass of warm milk but to no effect .
Sent 11: The dwarf is still unable to sleep , and therefore craves for some entertainment instead .
Sent 12: Felix then plays a clarinet , and the toy soldiers start dancing to his music .
Sent 13: After moving around for a few moments , one of the little soldiers fires a small cannon , piercing a picture on a wall with its projectile .
Sent 14: The dwarf was amazed by the presentation , and asks Felix to handover the cannon .
Sent 15: When Felix gives it and suddenly turns around , the hostile dwarf aims the small weapon at him and fires .
Sent 16: Felix was struck at the back and frightenedly flees the apartment .
Sent 17: Out in the streets , Felix looks for suitable resting places .
Sent 18: He then climbs up a telephone pole , and lies down on a set of pants hanging on one of the lines .
Question: Does Felix play the 'flute' or the 'clarinet'? (A) None (B) Flute (C) Both.

Ex Output:
C.

Ex Input:
Paragraph- Sent 1: At 9:48, a representative from the White House shelter asked if there were any indications of another hijacked aircraft.
Sent 2: The deputy director for operations mentioned the Delta flight and concluded that "that would be the fourth possible hijack."Sent 3: At 9:49, the commander of NORAD directed all air sovereignty aircraft to battle stations, fully armed.
Sent 4: At 9:59, an Air Force lieutenant colonel working in the White House Military Office joined the conference and stated he had just talked to Deputy National Security Advisor Stephen Hadley.
Sent 5: The White House requested (1) the implementation of continuity of government measures, (2) fighter escorts for Air Force One, and (3) a fighter combat air patrol over Washington, D.C.
Sent 6: By 10:03, when United 93 crashed in Pennsylvania, there had been no mention of its hijacking and the FAA had not yet been added to the teleconference.
Sent 7: The President and the Vice President The President was seated in a classroom when, at 9:05, Andrew Card whispered to him: "A second plane hit the second tower.
Sent 8: America is under attack."Sent 9: The President told us his instinct was to project calm, not to have the country see an excited reaction at a moment of crisis.
Sent 10: The press was standing behind the children; he saw their phones and pagers start to ring.
Sent 11: The President felt he should project strength and calm until he could better understand what was happening.
Sent 12: The President remained in the classroom for another five to seven minutes, while the children continued reading.
Sent 13: He then returned to a holding room shortly before 9:15, where he was briefed by staff and saw television coverage.
Sent 14: He next spoke to Vice President Cheney, Dr. Rice, New York Governor George Pataki, and FBI Director Robert Mueller.
Sent 15: He decided to make a brief statement from the school before leaving for the airport.
Sent 16: The Secret Service told us they were anxious to move the President to a safer location, but did not think it imperative for him to run out the door.
Sent 17: Between 9:15 and 9:30, the staff was busy arranging a return to Washington, while the President consulted his senior advisers about his remarks.
Sent 18: No one in the traveling party had any information during this time that other aircraft were hijacked or missing.
Sent 19: Staff was in contact with the White House Situation Room, but as far as we could determine, no one with the President was in contact with the Pentagon.
Question: How long from the time that air sovereignty aircraft were directed to battle stations did the United 93 crash in Pennsylvania (A) 61 minutes (B) 3 minutes (C) 14 minutes (D) An hour.

Ex Output:
C.