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 Input:
Question: Is low serum bilirubin concentration a predictor of chronic kidney disease?
Answer: Our study demonstrated that serum total bilirubin concentration could be a novel risk factor for the progression of CKD, defined as eGFR <60 ml/min/1.73 m(2), in the general population.

Ex Output:
yes


Ex Input:
Question: Is previous laparotomy a contraindication to laparoscopy-assisted gastrectomy for early gastric cancer?
Answer: There was no difference in outcome following LAG between the PSURG and NSURG groups in the present study. The PSURG patient is not contraindicated for LAG assuming careful attention is given for all operative procedures, including port insertion and dissection of intra-abdominal adhesions.

Ex Output:
no


Ex Input:
Question: Is a diverting stoma necessary when performing a handsewn coloanal anastomosis for lower rectal cancer?
Answer: The anastomotic complication rate was low even without a diverting stoma. This study suggests that a diverting stoma is not necessary when performing a handsewn coloanal anastomosis for lower rectal cancer however, an effort should be made for healthy anastomotic healing in patients with rectal cancer who are preoperatively radiated.

Ex Output:

no