The explanation for the given correct answer is that "ir" is indeed irregular in the subjunctive mood. In Spanish, the subjunctive mood is used to express doubt, uncertainty, wishes, desires, and recommendations. Regular verbs in the subjunctive mood follow a specific pattern, but "ir" does not. Instead, it undergoes a stem change in the present subjunctive, where the "e" in the stem changes to "i." Therefore, "ir" is irregular in the subjunctive mood, making the answer true.