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 postoperative intravenous drip infusion required after minilaparotomy cholecystectomy?
Answer: There is no clinical indication to continue IV drip infusion after full recovery from anaesthesia in patients operated for minilaparotomy cholecystectomy.

Ex Output:
no


Ex Input:
Question: Does clinical presentation and disease course of inflammatory bowel disease differ by race in a large tertiary care hospital?
Answer: We identified significant differences in disease characteristics and extraintestinal manifestations between AA and Ca IBD patients in a large tertiary care population. These results have implications for future genotype-phenotype studies.

Ex Output:
yes


Ex Input:
Question: Does the extent of the perihemorrhagic perfusion zone correlate with hematoma volume in patients with lobar intracerebral hemorrhage?
Answer: Our findings illustrate that the extent of the PHZ cannot be generally assumed to be constant in size and that this differs significantly following hematoma reduction in patients with space occupying lobar SICH.

Ex Output:

yes