Given the task definition and input, reply with output. In this task, you will be presented with a passage and have to answer a question based on your understanding of the events inferred from the passage. Among the entities, try to find the best entity that is most likely to fill in "_" and classify the answers based on options.

Medical student Lena Mamoun Abdelgadir (above), who has travelled to Syria to treat Jihadi fighters, once praised the Charlie Hebdo murders A British medical student who travelled to Syria to treat Jihadi fighters in Islamic State hospitals once praised the Charlie Hebdo murders, it emerged last night. Private schoolgirl Lena Mamoun Abdelgadir sent a smiling selfie to her sister as she crossed the border from Turkey on March 13 to reach Islamic State territory. The respected surgeon’s daughter is one of nine British doctors and students in their late teens or early 20s who are now believed to be volunteering in hospitals there.Medical student Lena Mamoun Abdelgadir praised Charlie Hebdo murdersShe was one of nine students who fled to Syria to treat ISIS Jihadi fightersPrivate schoolgirl sent a smiling selfie to sister before crossing into SyriaParents of the young medics have travelled to country to try and find them 
 Questions:The students’ parents believe that they have gone to Turkey to offer ‘voluntary medical help’ to _ refugees on the border. (A) Lena Mamoun Abdelgadir (B) Syria (C) Jihadi (D) Charlie Hebdo (E) British (F) Turkey (G) ISIS Jihadi

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
(B)