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: Obama was born on August 4, 1961, at Kapiolani 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.
Example output: D.
Example explanation: 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: On Thursday Fort Waelhem succumbed after a magnificent resistance.
Sent 2: The garrison held it until it was a mere heap of ruins, and, indeed, they had the greatest difficulty in making their way out.
Sent 3: I think that there is very little doubt that the Germans were using against these forts their largest guns, the great 42-centimetre howitzers.
Sent 4: It is known that two of these were brought northwards past Brussels after the fall of Maubeuge, and a fragment which was given to us was almost conclusive.
Sent 5: It was brought to us one morning as an offering by a grateful patient, and it came from the neighbourhood of Fort Waelhem.
Sent 6: It was a mass of polished steel two feet long, a foot wide, and three inches thick, and it weighed about fifty pounds.
Sent 7: It was very irregular in shape, with edges sharp as razors, without a particle of rust upon it.
Sent 8: It had been picked up where it fell still hot, and it was by far the finest fragment of shell I have ever seen.
Sent 9: Alas we had to leave it behind, and it lies buried in a back-garden beside our hospital.
Sent 10: Some day it will be dug up, and will be exhibited as conclusive evidence that the Germans did use their big guns in shelling the town.
Question: What town was the gun fragment found in? (A) Fort Waelhem (B) Fort Waelheim (C) Brussels (D) Northwards past Brussels after the fall of Maubeuge (E) Neighbourhood of Fort Waelhem.
A:
A, B, E.