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.

[EX Q]: Question: Is cD10 useful to identify gastrointestinal contamination in endoscopic ultrasound-guided fine needle aspiration ( EUS-FNA ) cytology from pancreatic ductal adenocarcinoma?
Answer: As a loss of CD10 is a consistent feature of PDA, this marker can be useful, together with CEA, to aid the cytopathologist to identify neoplastic cells in a background rich in GI contaminant cells.
[EX A]: yes

[EX Q]: Question: Do changes in basophil activation during grass-pollen sublingual immunotherapy correlate with clinical efficacy?
Answer: Allergen reactivity of peripheral blood basophils is not a biomarker for adverse events or early onset of clinical responses to SLIT.
[EX A]: no

[EX Q]: Question: Does mirtazapine improve sleep disorders in Alzheimer 's disease : results from a double-blind , placebo-controlled pilot study?
Answer: This study showed no significant therapeutic effects of 15-mg mirtazapine in community-dwelling Alzheimer's disease patients with sleep disorders. Instead, this study found evidence of worsening of daytime sleep patterns.
[EX A]:
no