Hey Goo, you asked two questions.
1. What is the rule for plurals in expressions like this
These expressions follow the form I mentioned in my other answer:
NOUN DE NOUN(S)
The usual rule for plurals in this form is to make the first noun plural.
La camisa de algodón (the cotton shirt)
Las camisas de algodón (the cotton shirts)
2. What is going on with the test question
In the test question question the format is different. This is because in Spanish we don't say "a fairy tale". Instead we say "a tale of fairies". So we write:
un cuento de hadas (a tale of fairies)
Here "cuento" (tale) is singular.
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