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 the covariation between burnout and sick leave due to mental disorders explained by a shared genetic liability : a prospective swedish twin study with a five-year follow-up?
Answer: The association between burnout and sick leave due to stress-related and other mental disorders seems to be a reflection of a shared genetic liability.

Ex Output:
yes

Ex Input:
Question: Is radiological review of specimen radiographs after breast localisation biopsy always necessary?
Answer: This study shows that a suitably trained or experienced surgeon can assess specimen radiographs effectively without the need for intraoperative radiological input although complete histological resection is not guaranteed despite specimen radiographs demonstrating clear margins.

Ex Output:
no

Ex Input:
Question: Do hLA-DQB1 subtypes predict diabetic retinopathy in patients with type I diabetes mellitus?
Answer: Some haplotypes seem to predispose diabetic patients to diabetic retinopathy. HLA typing may be beneficial for predicting the prognosis of diabetic retinopathy in younger diabetic patients.

Ex Output:
yes