Q: 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 ( 13 ) C enrichment of the CO2 in breast milk and in the breath rapidly modified by changes in the ( 13 ) C content of the diet?
Answer: Subjects eating a C4 diet have a higher (13)CPDBV value in the breath and breast milk fractions, which diminish rapidly on a C3 diet. Further studies focusing on individual nutrients are warranted.
A:
yes