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.

[EX Q]: Question: Is planimetry of aortic valve area using multiplane transoesophageal echocardiography a reliable method for assessing severity of aortic stenosis?
Answer: Planimetry of aortic valve area by TOE is difficult and less accurate than the continuity equation for assessing the severity of aortic stenosis.
[EX A]: no

[EX Q]: Question: Is daily physical activity in patients with chronic obstructive pulmonary disease mainly associated with dynamic hyperinflation?
Answer: Daily physical activity of patients with COPD is mainly associated with dynamic hyperinflation, regardless of severity classification.
[EX A]: yes

[EX Q]: Question: Do concurrent growth rate and transcript analyses reveal essential gene stringency in Escherichia coli?
Answer: RNA silencing can reveal stringent requirements for gene expression with respect to growth. This method may be used to validate existing essential genes and to quantify drug target requirement.
[EX A]:
yes