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.
Q: Question: Is [ Spiral CT cholangiography suitable for routine diagnosis before laparoscopic cholecystectomy ]?
Answer: Spiral CT cholangiography is useful for the diagnosis of common bile duct stones. Because of the low positive predicting value routine use before laparoscopic cholecystectomy is not justified.
A:
no