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: Magnets are able to place a force on certain materials.
Sent 2: This force is called a magnetic force.
Sent 3: The force a magnet exerts is a little different from the forces you may normally think about.
Sent 4: You exert a force on a book when you lift it.
Sent 5: You also exert a force on the pedals of your bicycle.
Sent 6: In both those cases, those forces cause a change.
Sent 7: The change you see in both these cases is called motion.
Sent 8: Magnets, too, can produce change.
Sent 9: They can produce motion just like you do.
Sent 10: Unlike you, magnets do not have to touch something to exert a force.
Sent 11: A magnetic force is exerted over a distance.
Sent 12: Thats right, a magnet can push or pull certain items without ever touching them.
Sent 13: Thats how the maglev train works.
Sent 14: Do you know another type of force that does not require objects to touch?
Sent 15: These forces are known as non-contact forces.
Sent 16: Another type of non-contact force you may be familiar with is gravity.
Sent 17: Gravity too can cause changes in motion.
Sent 18: Gravity holds our moon in orbit without touching it.
Question: Can magnets produce motion? (A) No, they can only produce change (B) No (C) Yes, they can.
Example Output: C.

Example Input: Paragraph- Sent 1: Amateur tennis star Guy Haines wants to divorce his vulgar and unfaithful wife Miriam , so he can marry the elegant and beautiful Anne Morton , daughter of a senator .
Sent 2: While on a train to meet Miriam , Haines meets Bruno Anthony , a forward stranger who recognizes Guy from gossip items in the newspapers that detail his marital problems .
Sent 3: During lunch in Bruno's compartment , Bruno tells Guy about his idea for the perfect '' Criss-cross '' murder : he will kill Miriam and in exchange , Guy will kill Bruno's father .
Sent 4: Since both are strangers , otherwise unconnected , there is no identifiable motive for the crimes , Bruno contends , hence no suspicion .
Sent 5: Guy hurriedly leaves the compartment but leaves Bruno thinking he has agreed to the deal .
Sent 6: Guy accidentally leaves his cigarette lighter behind , a gift from Anne to Guy , Which Bruno pockets .
Sent 7: Bruno heads to Guy's hometown of Metcalf and follows Miriam and her two beaux to an amusement park , where he briefly illuminates her face with Guy's lighter , then strangles her to death .
Sent 8: Guy's problems begin when his alibi an inebriated college professor on the same train as Guy can not remember their meeting .
Sent 9: But they increase exponentially when Bruno makes repeated appearances into Guy's life as he seeks to remind Guy that he is now obliged to kill Bruno's father , according to the bargain he thinks they struck on the train .
Sent 10: Bruno sends Guy the keys to his house , a map to his father's room , and a pistol .
Sent 11: Soon after , Bruno appears at a party at Senator Morton's house and hobnobs with the guests , much to Guy's apprehension and Anne's increasing suspicion .
Question: Why did Guy feel comfortable about telling Bruno about this murder plan? (A) He's a stragner (B) It was Bruno's plan (C) Bruno recognized Guy from the Papers (D) There was no connection between them (E) Old friends.
Example Output: A, B, D.

Example Input: Paragraph- Sent 1: Tropical climates are found around the equator.
Sent 2: These climates have warm temperatures year round.
Sent 3: Tropical climates may be very wet or wet and dry.
Sent 4: Tropical wet climates occur at or very near the equator.
Sent 5: They have high rainfall year round.
Sent 6: Tropical rainforests grow in this type of climate.
Sent 7: Tropical wet and dry climates also occur near the equator.
Sent 8: They receive less rainfall.
Sent 9: Most of the rain falls in a single season.
Sent 10: The rest of the year is dry.
Sent 11: Few trees can withstand the long dry season.
Sent 12: The main plants are grasses.
Sent 13: Dry climates receive very little rainfall.
Sent 14: They also have high rates of evaporation.
Sent 15: This makes them even drier.
Sent 16: Deserts can get less than 25 centimeters of rain per year.
Sent 17: Thats less than 10 inches per year.
Sent 18: How much rain do you get at your house?.
Question: In a tropical wet and dry climate, in how much of the year does it rain? (A) Much of the year is dry (B) Less than a week a year (C) All year long (D) In a single season (E) Most of the year (F) Most rain falls in a single season (G) Year round (H) In a wet climate.
Example Output:
A, D, F.