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.

Example Input: Question: Is nitric oxide-dependent renal vasodilatation altered in rat with rHuEpo-induced hypertension?
Answer: The analysis of our results seems to indicate that the endogenous NO system activity was enhanced in rHuEpo-induced hypertension in rats with normal renal function and a resistance to NO was not developed in renal circulation. Further studies seem to be necessary to better clarify the exact mechanisms underlying the development of rHuEpo-induced hypertension.
Example Output: no

Example Input: Question: Are cD44-9v and CD44-10v potential molecular markers for squamous cell carcinoma of the vulva?
Answer: Our findings warrant larger multi-institutional studies to determine the potential of CD44-9v and CD44-10v as molecular markers of disease recurrence in vulvar carcinoma. We propose to test the use of anti-CD44-9v monoclonal antibody for radioimmunoimaging of occult LN metastases.
Example Output: yes

Example Input: Question: Does the presence of horseshoe kidney affect the outcome of percutaneous nephrolithotomy?
Answer: PNL is the treatment of choice for large and/or complex stones. The presence of a horseshoe kidney does not affect the outcome of PNL. Upper pole access is usually preferred, and flexible nephroscopy is essential to maximize stone-free rates. SA and metabolic data support the premise that calculus formation is a metabolic event.
Example Output:
no