You will be given a definition of a task first, then some input of the task.
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.

Question: Is routine chest roentgenogram after central venous catheter insertion always necessary?
Answer: The results suggest that routine chest radiology after the insertion of a central venous catheter is not always necessary and that it should be ordered selectively, according to the findings made during the procedure and the subjective degree of difficulty.
Output:
no