Detailed 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.
Problem:Question: Do shoulder pain and external rotation in spastic hemiplegia improve by injection of botulinum toxin A into the subscapular muscle?
Answer: Application of botulinum toxin A into the subscapular muscle for reduction of shoulder pain and improvement of humeral external rotation in spastic hemiplegia does not appear to be clinically efficacious.
Solution:
no