I've never heard this word, but it could be because I am from Quebec. Is this a word that is used in france?
Yes, this also happened to me. It's frustratingly misleading, and I wrote a post elsewhere about the relevance of drop-down hints if they're not appropriate to the immediate question, as the student is focused on the question at hand, and if the hint means something else...why put it?!
You can say the gender pronoun + a form of etre when the sentence contains an adjective (and no nouns).
Elle est sympa.
But it becomes c'est when you add a noun in there.
C'est une sympa femme.
These articles explain it better than me: http://www.frenchtoday.com/blog/cest-versus-il-elle-est http://french.about.com/od/vocabulary/fl/Learn-the-French-Expressions-Cest-vs-Il-est.htm