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: Is early reduction in number of T cells producing proinflammatory cytokines , observed after extracorporeal photopheresis , linked to apoptosis induction?
Answer: Since proinflammatory cytokines play a major role in the pathology of GvHD, their down-regulation post-ECP may produce a direct clinical benefit. The lowest number of IL2-, IFNgamma- and TNFalpha-expressing T cells occurred within the apoptotic population; however, Annexin V-negative T cells also demonstrated a marked reduction post-ECP. However, the lack of an increase in IL4 and IL10 expression indicates that this process was not a consequence of skewing toward a Th2 cytokine profile.

Answer: no


Question: Question: Does incidental parathyroidectomy during thyroid surgery cause transient symptomatic hypocalcemia?
Answer: Unintended parathyroidectomy, although not uncommon, is not associated with symptomatic postoperative hypocalcemia. Modified radical neck dissection may increase the risk of incidental parathyroidectomy. Most of the glands removed were intrathyroidal, so changes in surgical technique are unlikely to markedly reduce this risk.

Answer: no


Question: Question: Is echium oil protective against weight loss in head and neck cancer patients undergoing curative radio ( chemo ) therapy : a randomised-controlled trial?
Answer: Echium oil effectively increased erythrocyte EPA and GLA FAs in H&N cancer patients. It failed however to protect against weight loss, or improve nutritional parameters.

Answer:
no