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.
Q: Question: Are p53 and vascular endothelial growth factor expressions two important indices for prognosis in gastric carcinoma?
Answer: The p53 expression may play an important role in controlling angiogenesis by regulating VEGF expression and VEGF expression is associated closely with disease recurrence. In addition, both p53 and VEGF expression might be useful in indicating the prognosis in patients with gastric carcinoma.
A:
yes