Chinese Internet search engine Baidu (NASDAQ:BIDU) was downgraded early Wednesday, while drugmakers Valeant Pharmaceuticals International (NYSE:VRX) and Shire (NASDAQ:SHPG) also saw analyst action.
In the context of the input sentence, determine the relationship between 'Baidu' and 'search engine'.
Options: position held, member of, stock exchange, product/material produced