While the Answers guidelines for answering a question suggests that answers be researched, there is no guarantee that all contributors adhere to the guidelines. Answers should be used as a starting point, and users are recommended to exercise judgement before following any advice received.
Anybody can sign up to Answers as a contributor, which means that the quality of answers may vary. There may be incorrect or inaccurate answers posted. One way to mitigate this risk is to look at the contributor's Confidence Votes. This is a measure of how useful this contributor's answers have been. However, this is still only an indication of popular opinion. The only way to ensure that an answer is correct is to undertake independent research.