Answer:
Descriptive adjective
Step-by-step explanation:
An adjective is word which describes, modifies or explains a noun, noun phrase or a pronoun in a sentence.
In the given sentence, the word French is acting as a descriptive adjective to the noun, bread.
Descriptive adjectives are known to be the mostly commonly used kind of adjective. It usually reveals the feature/quality of the noun.
The above answer is the correct answer.