From the given sentence, extract the phrase (often noun or verb) that carries the given relationship. The generated phrase should be present in the sentence.

[EX Q]: Given Relationship: 'be professor of', Sentence: 'Your nerves learn to communicate more effectively with your muscle cells , allowing the muscle to recruit more cells during each contraction , says Mark A. W. Andrews , PhD , associate professor of physiology at Lake Erie College of Osteopathic Medicine in Erie , Pa .'
[EX A]: professor

[EX Q]: Given Relationship: 'approve', Sentence: 'Some groups of mechanism of Adderall is I want to make it ca n't take the of it There are Donald fda approved generic viagra sildenafil citrate the commercial in prison anyone battling relaxed at the end product did n't stick .'
[EX A]: approved

[EX Q]: Given Relationship: 'be day after', Sentence: 'The day after Thanksgiving dubbed Black Friday because it historically was the day when a surge of shoppers helped stores break into profitability for the full year has been fading in importance particularly this year as stores were even more aggressive in discounting and pushing up sales event .'
[EX A]:
after

