Given a passage with a question and an answer to that question, classify if the answer actually answers the question into 'yes' or 'no'. Output 'yes' if the answer answers the question and output 'no' if the answer does not answer the question.

[Q]: Question: Is chronic cerebrospinal venous insufficiency associated with chronic venous disorders : A case-control study?
Answer: We found no association of CCSVI with the presence of CVD or family history of varicose veins.
[A]: no

[Q]: Question: Does diffusion-tensor imaging implicate prefrontal axonal injury in executive function impairment following very mild traumatic brain injury?
Answer: Impaired executive function following mTBI is associated with axonal injury involving the DLPFC.
[A]: yes

[Q]: Question: Is routine barium enema prior to closure of defunctioning ileostomy necessary?
Answer: Routine barium enema evaluation of low pelvic anastomoses before loop ileostomy closure did not provide any additional information for postoperative colorectal anastomotic complication.
[A]:
no