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 reduction in alkaline sphingomyelinase in colorectal tumorigenesis related to the APC gene mutation?
Answer: Alkaline sphingomyelinase is not directly linked to adenomatous polyposis coli gene mutations.
A:
no