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's the name of the clown who's left behind? (A) Doc (B) Chip (C) Rollo.

Ex Output:
C.

Ex Input:
Paragraph- Sent 1: Before crossing to Asia, Alexander wanted to safeguard his northern borders.
Sent 2: In the spring of 335 BC, he advanced to suppress several revolts.
Sent 3: Starting from Amphipolis, he traveled east into the country of the "Independent Thracians"; and at Mount Haemus, the Macedonian army attacked and defeated the Thracian forces manning the heights.
Sent 4: The Macedonians marched into the country of the Triballi, and defeated their army near the Lyginus river (a tributary of the Danube).
Sent 5: Alexander then marched for three days to the Danube, encountering the Getae tribe on the opposite shore.
Sent 6: Crossing the river at night, he surprised them and forced their army to retreat after the first cavalry skirmish.
Sent 7: News then reached Alexander that Cleitus, King of Illyria, and King Glaukias of the Taulanti were in open revolt against his authority.
Sent 8: Marching west into Illyria, Alexander defeated each in turn, forcing the two rulers to flee with their troops.
Sent 9: With these victories, he secured his northern frontier.
Sent 10: While Alexander campaigned north, the Thebans and Athenians rebelled once again.
Sent 11: Alexander immediately headed south.
Sent 12: While the other cities again hesitated, Thebes decided to fight.
Sent 13: The Theban resistance was ineffective, and Alexander razed the city and divided its territory between the other Boeotian cities.
Sent 14: The end of Thebes cowed Athens, leaving all of Greece temporarily at peace.
Sent 15: Alexander then set out on his Asian campaign, leaving Antipater as regent.
Question: What was Alexander's immediate response when Thebes and Athens rebelled? (A) Razed the city (B) Surrendered (C) Alexander headed south (D) Headed west (E) Barnett (F) Headed south.

Ex Output:
A, C, E, F.

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: What was the name of the younger brother of the murder victim? (A) Vikas (B) Revati (C) Vishal.

Ex Output:
C.