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: Do increased homocysteine levels exist in women with preeclampsia from early pregnancy?
Answer: Our results indicate that higher homocysteine levels exist in women with PE from early pregnancy and continue till delivery.

A: yes
****
Q: Question: Does nonresponse to pre-operative chemotherapy preclude long-term survival after liver resection in patients with colorectal liver metastases?
Answer: Liver resection offers a long-term survival benefit for patients with CRM, even when tumor growth proceeds during pre-operative chemotherapy.

A: no
****
Q: Question: Are leukemia inhibitory factor gene mutations in the population of infertile women restricted to nulligravid patients?
Answer: The results suggest that the LIF gene mutations affect fertility. Even though they occur infrequently, their impact on molecular events during early phases of pregnancy should be further established.

A:
no
****