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: Is the ribbon-associated protein C-terminal-binding protein 1 essential for the structure and function of retinal ribbon synapses?
Answer: Overall the results suggest that CtBP1 protein is not essential for the formation of functional ribbon synapses in the retina.

A: no
****
Q: Question: Is pseudomonas aeruginosa in CF and non-CF homes found predominantly in drains?
Answer: These findings implicate drains as important potential sources of P. aeruginosa infection. They suggest that maximizing P. aeruginosa control efforts for drains would reduce exposure with minimal extra burden to CF patients and families.

A: yes
****
Q: Question: Do screening and ultrasound surveillance of large abdominal aortic aneurysms improve suitability for endovascular repair?
Answer: Early detection and surveillance of AAA does not seem to increase suitability for EVAR. Suitability for EVAR seems to be determined early on in an aneurysm's life. On the basis of current device technology, referral for intervention from an AAA surveillance program may need to be initiated at a size well below 5.5 cm if an increase in EVAR suitability is to be expected.

A:
no
****