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.

Input: Consider Input: Paragraph- Sent 1: In October 1933 Einstein returned to the U.S. and took up a position at the Institute for Advanced Study (in Princeton, New Jersey), noted for having become a refuge for scientists fleeing Nazi Germany.
Sent 2: At the time, most American universities, including Harvard, Princeton and Yale, had minimal or no Jewish faculty or students, as a result of their Jewish quota which lasted until the late 1940s.
Sent 3: Einstein was still undecided on his future.
Sent 4: He had offers from several European universities, including Oxford where he stayed for three short periods between May 1931 and June 1933, however in 1935 he arrived at the decision to remain permanently in the United States and apply for citizenship.
Sent 5: Einstein's affiliation with the Institute for Advanced Study would last until his death in 1955.
Sent 6: He was one of the four first selected (two of the others being John von Neumann and Kurt Godel) at the new Institute, where he soon developed a close friendship with Godel.
Sent 7: The two would take long walks together discussing their work.
Sent 8: Bruria Kaufman, his assistant, later became a physicist.
Sent 9: During this period, Einstein tried to develop a unified field theory and to refute the accepted interpretation of quantum physics, both unsuccessfully.
Question: How many years was Einstein affiliated with the Institute for Advanced Study? (A) Over 20 years (B) 22 years (C) 20 years (D) 2 years.

Output: B, C.

Input: Consider Input: Paragraph- Sent 1: At 8:38, Ong told Gonzalez that the plane was flying erratically again.
Sent 2: Around this time Sweeney told Woodward that the hijackers were Middle Easterners, naming three of their seat numbers.
Sent 3: One spoke very little English and one spoke excellent English.
Sent 4: The hijackers had gained entry to the cockpit, and she did not know how.
Sent 5: The aircraft was in a rapid descent.
Sent 6: At 8:41, Sweeney told Woodward that passengers in coach were under the impression that there was a routine medical emergency in first class.
Sent 7: Other flight attendants were busy at duties such as getting medical supplies while Ong and Sweeney were reporting the events.
Sent 8: At 8:41, in American's operations center, a colleague told Marquis that the air traffic controllers declared Flight 11 a hijacking and "think he's [American 11] headed toward Kennedy [airport in New York City].
Sent 9: They're moving everybody out of the way.
Sent 10: They seem to have him on a primary radar.
Sent 11: They seem to think that he is descending."Sent 12: At 8:44, Gonzalez reported losing phone contact with Ong.
Sent 13: About this same time Sweeney reported to Woodward, "Something is wrong.
Sent 14: We are in a rapid descent .
Sent 15: we are all over the place."Sent 16: Woodward asked Sweeney to look out the window to see if she could determine where they were.
Question: How did the flight attendants keep the passengers calm while they were reporting the hijacking to the ground operations? (A) Telling people to prepare for a takeover (B) They told passengers they had a medical emergency on board and had other flight attendants take care of passengers while they reporting the events to officials (C) That there was a routine medical emergency in first class (D) The passengers were not calm (E) They were told there was a medical emergency (F) By providing alcohol.

Output: B, C, E.

Input: Consider Input: Paragraph- Sent 1: Mike and Jeff are close friends.
Sent 2: Their school is having a guessing game to guess how many gumballs are in a box.
Sent 3: If they get the right amount they win $100.
Sent 4: If they get close they get a $20 gift card.
Sent 5: The box looks like it is missing some gumballs.
Sent 6: It turns out some people are eating them when they place their guess.
Sent 7: 100 people guessed and took a piece of candy.
Sent 8: The box is 10" by 10" by 10".
Sent 9: Each gumball is 1" each.
Sent 10: Mike guessed 500.
Sent 11: Jeff guessed 800.
Sent 12: They both said they would split their money they win, if they win.
Question: If there were 500 gumballs in the box how much money would Mike and Jeff get each? (A) 100 (B) $50 (C) 50 (D) In dollars (E) 150.
Output: C.