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: Eric , a young boy , is excited about his birthday after reading a book and believes that a train will come for him , despite his sister Jill's disbelief .
Sent 2: A few hours later , the train station's control tower wakes up and in the roundhouse , Tillie , a young little blue switcher engine , along with her best bird friend , Chip , wakes up four other trains : Georgia , a kind all-purpose engine , Farnsworth , a stuck-up passenger engine , Jebediah , a worn-out old engine , and Pete , a gruff , burly freight engine .
Sent 3: After the tower assigns Farnsworth and Pete their jobs , Tillie tries to help with the milk train assigned to Jebediah , but the tower insists that she is too small for the job .
Sent 4: Georgia is assigned to pull the birthday train .
Sent 5: A clown named Rollo leads the toys into the train , including Stretch , a basketball player ; Missy , a ballerina ; a Handy Pandy , a panda ; Perky , an elephant ; and Grumpella , a stuffed bird .
Sent 6: During her journey , Georgia breaks down and is taken back to the roundhouse by Doc .
Sent 7: Left behind , Rollo eventually takes Doc's advice of flagging down one of the other engines returning from their daily runs over the mountain .
Sent 8: Farnsworth and Pete turn down their offers to pull the train .
Sent 9: Meanwhile , Tillie asks the tower to rescue the stranded train , but he insists that Tillie will never do the job .
Sent 10: Jebediah turns down his offer to pull the train because of his age , and returns to the roundhouse .
Sent 11: Chip and Tillie sneak past the sleeping tower and pulls the birthday train up a mountain .
Question: What kind of train engine is assigned to pull the birthday train? (A) A stuck-up passenger engine (B) Georgia (C) Farnsworth (D) A kind all-purpose engine (E) Pete (F) A worn-out old engine.

Ex Output:
B, D.

Ex Input:
Paragraph- Sent 1: Elaan is a declaration of war against the reign of terror unleashed by the ganglords .
Sent 2: The story revolves around an upright and principled Police Officer , A.C.P. Ramakant Chaudhary whose eldest son Vikas is killed in a pre-planned accident .
Sent 3: But the A.C.P. is unable to nab the culprits for want of valid evidence .
Sent 4: Consequently , the A.C.P. , his wife Revati and younger son Vishal are griefstricken over the loss of young Vikas .
Sent 5: While the atmosphere in the city is already vitiated by the atrocities of ganglords Baba Khan and Manna Shetty who enjoy the support of some unscrupulous police personnel , the A.C.P. vows to make the ruthless gangsters bite the dust , without taking the law in his own hands .
Sent 6: On the other hand , Vishal an angry young man , can not stand this injustice since the police had failed to arrest his brother's killers , and he silently resents his A.C.P father's inaction in dealing with the culprits .
Sent 7: The ideologies of the father and son clash - Which lead to a conflict between a dutiful father and a reckless son .
Sent 8: The only one who understands the agony of Vishal is Mohini , the daughter of head constable Devkinandan Sharma .
Sent 9: The day comes when Vishal confronts Baba Khan and Manna Shetty Which leads to tension and gory situation for the A.C.P. , as the ganglords threaten to eliminate the A.C.P. as well as his wife Revati and son Vishal .
Question: Who is unable to nab the culprits in search of evidence? (A) Revati (B) The A.C.P (C) Vishal (D) Ramakant (E) A.C.P. Ramakant Chaudhary.

Ex Output:
B, E.

Ex Input:
Paragraph- Sent 1: A group of researchers at a remote jungle island outpost discover the natives are practicing voodoo and black magic .
Sent 2: After killing the local priest , a voodoo curse begins to raise the dead to feed on the living in retribution .
Sent 3: The researchers on the island are killed by the newly risen zombies , except for Jenny , the daughter of a scientist couple .
Sent 4: She escapes , protected by an enchanted necklace charm given to her by her mother shortly before her death .
Sent 5: She returns years later as an adult with a group of mercenaries to attempt to uncover what happened to her parents .
Sent 6: Shortly after arriving at the island their boat 's engine dies , stranding them .
Sent 7: Meanwhile elsewhere on the island a trio of hikers discover a cave , the same cave leading to the underground temple where the original curse was created .
Sent 8: After accidentally reviving the curse , the dead once again return to kill any who trespass on their island .
Sent 9: The mercenaries encounter their first zombie , who injures a member of the team .
Sent 10: Taking shelter in the remains of the old research facilities medical quarters they are soon joined by Chuck , the only surviving hiker .
Sent 11: Arming themselves with weapons left behind by the long dead research team , they make their stand as the dead once again rise .
Sent 12: One by one they are injured or killed , one of whom sacrifices himself to blow up the medical facility and his newly undead team members .
Sent 13: Jenny and Chuck flee , the only survivors remaining .
Sent 14: They stumble upon the cave once again , where the zombies appear and attack .
Question: What are the deads called who feed on the living in retribution? (A) Natives (B) Zombies (C) Warhead.

Ex Output:
B.