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.

Example Input: Question: Does the ets-domain transcription factor Spdef promote maturation of goblet and paneth cells in the intestinal epithelium?
Answer: Spdef acts downstream of Math1 to promote terminal differentiation of a secretory progenitor pool into Paneth and goblet cells.
Example Output: yes

Example Input: Question: Does comprehensive analysis suggest simple processes underlying EEG/ERP - demonstration with the go/no-go paradigm in ADHD?
Answer: We show how these processes accord with and provide insight on the waveforms reported in the literature.
Example Output: yes

Example Input: Question: Does stat3 signaling activation crosslinking of TGF-1 in hepatic stellate cell exacerbate liver injury and fibrosis?
Answer: We provide a novel role of Stat3 cooperating TGF-1 in activation and anti-apoptotic effect of HSCs. Stat3 worsens liver fibrosis through the up-regulation of TGF-1 and fibrotic product expression.
Example Output:
yes