TASK DEFINITION: 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.
PROBLEM: Question: Is tumor differentiation a risk factor for lymph node metastasis in elderly patients with early gastric cancer?
Answer: Elderly patients with undifferentiated type histology early gastric cancer without other risk factors for lymph node metastasis may be candidates for endoscopic resection.

SOLUTION: no

PROBLEM: Question: Is cardiac autonomic neuropathy in patients with uraemia related to pre-diabetes?
Answer: The prevalence of CAN and impaired glucose tolerance is high in uraemic patients, but impaired glucose tolerance seems to play no significant role in the aetiology of CAN in uraemic patients.

SOLUTION: no

PROBLEM: Question: Do serum cytokine levels correlate with disease activity and severity assessed by brain MRI in multiple sclerosis?
Answer: Our data show that the determination of serum levels of the investigated cytokines and cytokine receptors is not useful as a tool to determine subclinical disease activity and severity as assessed by brain MRI.

SOLUTION:
no