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: Dr. Benjamin Stone is a hotshot young surgeon who longs to leave the drudgery of a Washington , D.C. emergency room and finally leaps at his chance at more money and less death as a plastic surgeon in Beverly Hills .
Sent 2: On his last day , Ben's relationship with his co-workers is presumed to be anything but a warm one .
Sent 3: None of his colleagues will join him for a drink and a cake in his honor has an iced portion of the phrase '' Good riddance , asshole '' sliced out .
Sent 4: Ben's cross-country drive in a 1956 Porsche 356 Speedster is interrupted when he crashes in the rural hamlet of Grady , South Carolina .
Sent 5: The crash damages the fence of local Judge Evans , who sentences him to community service at a nearby hospital .
Sent 6: Ben offers to pay for the fence , but the stern judge increases his community service each time he talks back .
Sent 7: Defeated , he reports to the hospital , where Nurse Packer humbles him by ordering him to clock in and out , as would a factory worker .
Sent 8: Though upset , Ben quickly makes friends with Mayor Nick Nicholson , the town cafe's proprietor/head waitress , and Melvin , the local mechanic tasked with repairing Ben's car .
Sent 9: Ben soon finds his clinic work to be much more laid-back than the emergency room .
Sent 10: He has simple cases such as spots before the eyes , fishing hook impalings , and even reading mail for a young illiterate couple , whose baby he later delivers .
Sent 11: The experience also humbles Ben when he mistreats a case of mitral valve regurgitation leading to late cyanosis in the child .
Question: Was Ben involved in a crash? (A) No (B) Yes he was in a train crash (C) Yes (D) Yes a car crash.

Ex Output:
C, D.

Ex Input:
Paragraph- Sent 1: The properties of matter depend on the types of atoms that matter is made of.
Sent 2: Matter can exist in two forms.
Sent 3: It can be a pure substance.
Sent 4: This means it is not mixed with anything.
Sent 5: It can also be a combination of different substances.
Sent 6: This means it can be a mix of different types of atoms.
Sent 7: You may recall that atoms differ based on the numbers of protons they contain.
Sent 8: Some atoms contain only one proton such as Hydrogen.
Sent 9: Other atoms contain many protons.
Sent 10: There are many types of atoms.
Sent 11: For example, Helium has two protons.
Sent 12: An Oxygen atom has eight.
Sent 13: Water is composed of a two types of atoms.
Sent 14: Water is made of two Hydrogen atoms and one Oxygen atoms.
Sent 15: There are only so many types of atoms.
Sent 16: These atoms can be mixed into an almost limitless amount of substances.
Sent 17: So what do we call a substance that has only a single type of atom?.
Question: What type of matter means it can be made up of a mix of different type of atoms? (A) Pure (B) A pure substance (C) Combination of different substances (D) Mixture.

Ex Output:
C, D.

Ex Input:
Paragraph- Sent 1: Paris, France (CNN) -- Hundreds of French workers, angry about proposed layoffs at a Caterpillar factory, were holding executives of the company hostage Tuesday, a spokesman for the workers said.
Sent 2: Caterpillar's French staff say they are angry about a lack of negotiations over layoffs.
Sent 3: It is at least the third time this month that French workers threatened with cutbacks have blockaded managers in their offices to demand negotiations.
Sent 4: Executives were released unharmed in both previous situations.
Sent 5: The latest incident started Tuesday morning at the office of the construction equipment company in the southeastern city of Grenoble.
Sent 6: The workers were angry that Caterpillar had proposed cutting more than 700 jobs and would not negotiate, said Nicolas Benoit, a spokesman for the workers' union.
Sent 7: They did not want to harm the Caterpillar executives, Benoit told CNN.
Sent 8: One hostage was released Tuesday evening leaving workers with four captives inside the Caterpillar building.
Sent 9: The released man was a human resources director identified only as Mr. Petit, because he has heart problems, union representative Bernard Patrick told CNN.
Sent 10: Petit had a heart attack a few weeks ago, Patrick said.
Sent 11: The four others still being held are Nicolas Polutnik, the head of operations; two other executives; and Petit's personal assistant, he said.
Sent 12: About 500 employees were also outside the building protesting.
Question: What is the first name of the man who tells CNN that workers do not want to harm Caterpillar executives? (A) Petit (B) Nicolas (C) Benoit.

Ex Output:
B.