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.

Input: Consider Input: Question: Does prescription consisting of Vitamin C and Baicalin inhibit tumor growth by enhancing the antioxidant capacity in vivo?
Answer: PVB shows better antitumor effect than Vc and baicalin used alone, and it can significantly enhance the immunity and antioxidant capacity of the mice.

Output: yes


Input: Consider Input: Question: Is the risk of uterine rupture increased with single- compared with double-layer closure : a Swedish cohort study?
Answer: There was no significant difference in the rate of uterine rupture when single-layer closure was compared with double -layer closure of the uterus.

Output: no


Input: Consider Input: Question: Does mixing bone graft with OP-1 improve cup or stem fixation in revision surgery of the hip : 5-year follow-up of 10 acetabular and 11 femoral study cases and 40 control cases?
Answer: The sample size and study design in our evaluation did not allow any firm conclusions. Absence of any trend to improved fixation and early revisions in the study group prompted us to stop recruitment to this study.


Output: no