See the second definition.
http://dictionary.reference.com/browse/immunity
why is a chemically sensitive person not able to build an immunity to perfume?
what does "immunity" mean?
5 answers
i understand what immunity means now, but i still don't know how to answer this question.
http://txeh.org/What%20Is%20Chemical%20Sensitivity.htm
yeah like i know what chemical sensitivity is but i just don't undertand what the question is asking
I don't know how to simplify this question any further. Sorry.