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: (CNN) -- Declaring 2010 "The best year in safety performance in our company's history," Transocean Ltd., owner of the Gulf of Mexico oil rig that exploded, killing 11 workers, has awarded its top executives hefty bonuses and raises, according to a recent filing with the U.S. Securities and Exchange Commission.
Sent 2: That includes a $200,000 salary increase for Transocean president and chief executive officer Steven L. Newman, whose base salary will increase from $900,000 to $1.1 million, according to the SEC report.
Sent 3: Newman's bonus was $374,062, the report states.
Sent 4: Newman also has a $5.4 million long-term compensation package the company awarded him upon his appointment as CEO in March 2010, according to the SEC filing.
Sent 5: The latest cash awards are based in part on the company's "performance under safety," the Transocean filing states.
Sent 6: "Notwithstanding the tragic loss of life in the Gulf of Mexico, we achieved an exemplary statistical safety record as measured by our total recordable incident rate and total potential severity rate," the SEC statement reads.
Sent 7: "As measured by these standards, we recorded the best year in safety performance in our Company's history."Sent 8: The company called that record "a reflection on our commitment to achieving an incident-free environment, all the time, everywhere," the SEC filing states.
Sent 9: The company did not respond to an e-mail from CNN seeking comment.
Sent 10: The April 20, 2010, explosion on the Deepwater Horizon rig injured 17 workers and killed 11 others, including nine Transocean employees, according to the SEC filing.
Sent 11: It has been called the worst spill in U.S. history.
Sent 12: The well was capped three months later, but not before millions of barrels of oil spilled into the Gulf.
Sent 13: In January, President Barack Obama's National Commission on the BP Deepwater Horizon Oil Spill and Offshore Drilling released a report that spread blame for the accident among Transocean, BP -- which leased the rig -- and Halliburton, which installed the rig's cement casing.
Question: What is the name of the oil rig in the Gulf of Mexico (A) Transocean Ltd (B) Transmission (C) Halliburton (D) Transvision (E) Deepwater Horizon (F) Transocean.
Example Output: A, E.

Example Input: Paragraph- Sent 1: Rough surfaces create more friction than smooth surfaces.
Sent 2: Thats why cars have tires.
Sent 3: Its also why we use rubber mats in areas that might get wet.
Sent 4: In your bathtub, you may even use No-Slip tape.
Sent 5: No-slip is another way of saying the items has a lot of friction.
Sent 6: In Figure 1.9, the blades of the skates are very smooth.
Sent 7: Thats why you cant slide across ice with shoes.
Sent 8: The soles of your shoes are much rougher than skates.
Sent 9: The rougher surface of shoes causes more friction and slows you down.
Sent 10: Heavier objects also have more friction.
Sent 11: A heavy object presses down with more force.
Sent 12: The surfaces are held together more tightly.
Sent 13: This makes the surfaces harder to slide past each other.
Sent 14: Did you ever try to push something heavy across the floor?
Sent 15: Heavy objects are much harder to push than light objects.
Question: Why do heavier objects have more friction? (A) A heavy object presses down with more force. The surfaces are held together more tightly, making the surfaces harder to slide past each other (B) Held down with more force to a surface which holds them together more tightly (C) Weight has invese relation with friction (D) Dresser.
Example Output: A, B.

Example Input: Paragraph- Sent 1: Littlefoot 's grandfather one night tells the children a story about '' The Lone Dinosaur '' , a legendary longneck who once protected the Great Valley from the most ferocious sharptooth ever to live .
Sent 2: A fight ensued , which led to the Sharptooth 's death .
Sent 3: However , the sharptooth left '' The Lone Dinosaur '' with a scar slashed across his right eye .
Sent 4: Soon after the battle , a huge monolith that resembled a proud sauropod , having life-sized Sharptooth teeth arranged around his neck , came out of the ground during an earthquake .
Sent 5: The dinosaurs called it '' Saurus Rock '' .
Sent 6: The legend also states that if anyone damages the monolith , bad luck would descend upon the valley .
Sent 7: A few days later when the kids are playing , Littlefoot accidentally falls off a cliff .
Sent 8: Just before he hits the ground , a gruff Diplodocus rescues him .
Sent 9: This longneck introduces himself only as '' Doc '' and gives no knowledge of his history .
Sent 10: Littlefoot is intrigued by this newcomer , who is scarred across one eye and displays prior knowledge of the Great Valley 's topography .
Sent 11: For the preceding reasons , Littlefoot assumes that Doc is the Lone Dinosaur .
Sent 12: He tells his friends this , narrating an apparently extemporaneous legend to support his assumption .
Sent 13: Inspired , Cera 's infant nieces , the twins Dinah and Dana , go to Saurus Rock without anyone noticing .
Sent 14: Later when the friends are playing , they notice that Dinah and Dana are missing .
Sent 15: Recalling their talk of the day before , they go to Saurus Rock to find them .
Question: Who rescues Littlefoot when falling off a cliff? (A) Doc (B) Cera (C) His grandfather.
Example Output:
A.