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: When you get sick, your body springs to action.
Sent 2: Your body starts to fight the illness.
Sent 3: Thats why you want to eat right and get plenty of sleep.
Sent 4: You need a strong immune system to fight off illness.
Sent 5: Plants dont have an immune system.
Sent 6: That does not mean they do not get sick.
Sent 7: Plants are affected by disease just like us.
Sent 8: Typically, their first line of defense is the death of part of the plant.
Sent 9: This prevents the infection from spreading.
Sent 10: Many plants also produce special chemicals to fight disease.
Sent 11: For example, willow trees produce a chemical to kill the bacteria.
Sent 12: The same compound is used in many acne products.
Sent 13: You can see a picture of a willow tree in Figure Plants may be smarter than we think.
Sent 14: No, they cannot talk to each other.
Sent 15: They may be able to send messages, though.
Question: What can help you to have a strong immune system? (A) Exercise (B) Lack of sleep (C) Eat an apple a day (D) Get lots of sunlight (E) Eat right and get plenty of sleep.

Ex Output:
E.

Ex Input:
Paragraph- Sent 1: Fossils can be used to match up rock layers.
Sent 2: As organisms change over time, they look different.
Sent 3: Older fossils will look different than younger fossils.
Sent 4: Some organisms only survived for a short time before going extinct.
Sent 5: Knowing what organisms looked like at certain times also helps date rock layers.
Sent 6: Some fossils are better than others for this use.
Sent 7: The fossils that are very distinct at certain times of Earths history are called index fossils.
Sent 8: Index fossils are commonly used to match rock layers.
Sent 9: You can see how this works in Figure 2.30.
Sent 10: If two rock layers have the same index fossils, then they're probably about the same age.
Question: How are index fossils useful? (A) They show us flora of the past (B) Knowing what organisms looked like at certain times also helps date rock layers, and index fossils are the fossils that are very distinct at certain times of Earth's history (C) The fossils that are very distinct at certain times of Earths history and help date fossils (D) For fuel (E) They help to determineage of rock layers (F) They are used to mark water levels (G) They are used to identify extinct animals (H) As markers for glacier activity.

Ex Output:
B, C, E.

Ex Input:
Paragraph- Sent 1: We waited for half an hour, watching the smoke curling over the house, and then, judging that the Indians had made off for fear of being ambushed, we crossed the clearing.
Sent 2: It took but a glance to read the story.
Sent 3: The women had been washing by the little brook before the cabin, with the children playing about them, when the Indians had come up and with a single volley killed them all except the child we had heard crying.
Sent 4: They had swooped down upon their victims, torn the scalps from their heads, looted the house, and set fire to it.
Sent 5: We dragged out the body of the woman which had been thrown within, in the hope that a spark of life might yet remain, but she was quite dead.
Sent 6: Beneath the warrior Spiltdorph had shot we found the child.
Sent 7: It was a boy of some six or seven years, and so covered with blood that it seemed it must be dead.
Sent 8: But we stripped it and washed it in the brook, and found no wounds upon it except in the head, where it had been struck with a hatchet before its scalp had been stripped off.
Sent 9: The cold water brought it back to life and it began to cry again, whereat Spiltdorph took off his coat and wrapped it tenderly about it.
Question: Who had a name in the story? (A) The warrior (B) Spiltdorph.

Ex Output:
B.