The given correct answer "mort" is the past participle form of the verb "mourir" in French, which means "to die". The past participle is used to form compound tenses in French, such as the passé composé. In this case, "mort" is the past participle used with the auxiliary verb "être" to form the passé composé tense, for example, "Il est mort" (He died). Therefore, "mort" is the correct answer as it is the past participle form of the verb "mourir".