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 Input:
Question: Does diffusion-tensor imaging implicate prefrontal axonal injury in executive function impairment following very mild traumatic brain injury?
Answer: Impaired executive function following mTBI is associated with axonal injury involving the DLPFC.

Ex Output:
yes

Ex Input:
Question: Does adenosine-activated myocardial ischemia induce delayed preconditioning?
Answer: Adenosine-induced ischemia does not exert a delayed protective effect in respect to cardiac bioelectrical and mechanical functions in patients with ischemic heart disease in the form of stable effort angina.

Ex Output:
no

Ex Input:
Question: Does gastroprotective effect of the iridoid fraction from Barleria prionitis leave on experimentally-induced gastric ulceration?
Answer: The data shows that the iridoid fraction from BPE possesses anti-ulcerogenic and antioxidant potential.

Ex Output:
yes