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: Question: Does l-Tryptophan influence acute ventilatory response at moderate altitude?
Answer: L-tryptophan does not impair ventilatory adaptation to mild hypoxia at moderate altitude.

Answer: no

Question: Question: Is chronic cerebrospinal venous insufficiency associated with chronic venous disorders : A case-control study?
Answer: We found no association of CCSVI with the presence of CVD or family history of varicose veins.

Answer: no

Question: Question: Are in Rasmussen encephalitis , hemichannels associated with microglial activation linked to cortical pyramidal neuron coupling : a possible mechanism for cellular hyperexcitability?
Answer: In RE, these results support the notion that a possible mechanism for cellular hyperexcitability may be related to increased intercellular coupling from pannexin linked to increased microglial activation. Such findings suggest that a possible antiseizure treatment for RE may involve the use of gap junction blockers.

Answer:
yes