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.
One example is below.
Q: Paragraph- Sent 1: Obama was born on August 4, 1961, at Kapiʻolani Maternity & Gynecological Hospital in Honolulu, Hawaii.
Sent 2: He is the only President to have been born in Hawaii.
Sent 3: He was born to a white mother and a black father.
Sent 4: His mother, Ann Dunham (1942-1995), was born in Wichita, Kansas, of mostly English descent, with some German, Irish, Scottish, Swiss, and Welsh ancestry. Question: How old was Obama's mother when he was born? (A) teenager (B) in his 40s (C) mid 20s (D) almost twenty.
A: D.
Rationale: Obama was born in 1961. His mother was born in 1942 and 1961-1942=19. Therefore, "almost twenty" answers the question sufficiently.
Q: Paragraph- Sent 1: Oh no!
Sent 2: Your younger sister just mixed up all of your LEGO parts.
Sent 3: Now you have to put them all back into the original categories.
Sent 4: How will you do this?
Sent 5: You sort them by size and shape until they are each back into their specific place in the tray.
Sent 6: What do you think you could have called the mess your younger sister created?
Sent 7: Thats right, it is a mixture.
Sent 8: Fortunately, it was a physical change and she just made a simple mixture.
Sent 9: You are able to separate them back into order.
Sent 10: Its a good thing she did not toss them into the fireplace.
Sent 11: That would have caused a chemical change as they all melted together.
Sent 12: If your LEGOs were melted, you would be out of luck for building that next big project. 
Question: Why do you have to sort your LEGOs and put them in the tray? (A) Your sister mixed them together (B) You dropped them near the fireplace (C) They were mixed together (D) Your younger sister mixed them all up (E) You mixed them together.
A:
A, C, D.