Instructions: 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: Question: Is tDP-43 a common cause of sporadic amyotrophic lateral sclerosis?
Answer: Our data indicate that genetic variation in TARDBP is not a common cause of sporadic ALS in North American.
Output:
no