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.

Example Input: Paragraph- Sent 1: Porky is looking all over the big city for a hotel room , but due to a convention there are no vacancies .
Sent 2: Porky takes the only available vacancy at one hotel , but will have to share with Daffy Duck , who is a very loud , obnoxious and annoying sort .
Sent 3: Daffy introduces his invisible kangaroo friend '' Hymie '' , but Porky wo n't believe that .
Sent 4: Daffy spends the rest of the night annoying Porky : pestering him with questions , shaking the bed , spilling water from a glass , hogging the blanket and finally literally sending the both of them flying off the bed when Daffy kicks , and startles , Porky with his literally frozen feet .
Sent 5: Fed up with his antics , Porky stuffs Daffy in a pillow case and drops him out of the window .
Sent 6: As Porky goes back to bed , Daffy returns bandaged , but shakes them off and prepares to get revenge .
Sent 7: Daffy tricks the half-asleep pig into stepping out of a window thinking he 's boarding a train .
Sent 8: Daffy hides the window saying it 's '' too gruesome '' to watch .
Sent 9: Suddenly he hears train noises , and behind the shade , sees the still-drowsy Porky pulling away on an actual train and waving at Daffy .
Sent 10: Daffy finds this silly .
Sent 11: Then he bounces all around the room , '' Hoo-Hoo ! ''Sent 12: - ing wildly .
Question: Who hears the train noises (A) Daffy (B) Porky (C) Bugs Bunny.
Example Output: A.

Example Input: Paragraph- Sent 1: Milwaukee, Wisconsin (CNN) -- President Barack Obama, in a bid to create jobs and boost economic growth, called on Congress on Monday to pass a $50 billion plan to renew the country's transportation infrastructure.
Sent 2: His address was the first of two speeches the president is scheduled to make this week to frame his administration's ongoing response to the recession, less than two months ahead of midterm elections in which Democratic majorities in the House and Senate are in jeopardy.
Sent 3: "Today, I am announcing a new plan for rebuilding and modernizing America's roads, and rails and runways for the long term," said Obama, who spoke on Labor Day in Milwaukee, Wisconsin -- a state with competitive gubernatorial and U.S. Senate races.
Sent 4: "We used to have the best infrastructure in the world.
Sent 5: We can have it again," he said to loud cheers from a crowd of union workers.
Sent 6: The proposal envisions -- over a six year period -- rebuilding 150,000 miles of roads, 4,000 miles of rail and 150 miles of airport runways.
Sent 7: It also would include modernizing the nation's air traffic control system in an effort to reduce delays and travel time.
Sent 8: "This will not only create jobs immediately.
Sent 9: It's also going to make our economy hum over the long haul," said the president.
Sent 10: Obama hopes to work with Congress to enact an up-front investment of $50 billion -- an amount a White House statement said would represent a significant chunk of new spending on infrastructure.
Sent 11: The investment would then be paired with what the administration called a framework to improve transportation spending.
Sent 12: The long-term plan would include the establishment of an Infrastructure Bank, which would leverage federal dollars and focus on projects that could deliver the the biggest bang for the buck, Obama said.
Sent 13: The president stressed the need for Democrats and Republicans to work together on the transportation initiative, which would need to be approved by Congress.
Question: What as President Obama asking Congress for to implement his plan to renew the country's transportation infrastructure? (A) Six years to rebuild many roads, rails, and runways (B) The creation of the "Infrastructure Bank" to help fund the renewal in the most efficient way (C) To implement the "National Bank (D) To be proud of him (E) For them to create a six year plan to rebuild roads, rails, and runways (F) To work together on his new plan and to support it (G) A $50 billion investment.
Example Output: A, B, F, G.

Example 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: How many people besides Mr. Petit were held hostage? (A) 4 (B) Four others (C) 500 workers (D) Seven (E) Four other people were held hostage (F) Nicolas Polutnik, the head of operations; two other executives; and Petit's personal assistant (G) 7 (H) Only Nicolas Polutnik.
Example Output:
A, B, E, F.