How can i delte an item from a 2D Array?

Question

so this code selects a random item from a 2d list, however after that being selected, it want that item to be gone from the 2d list, how can i do so?

int random_num1 = random.nextInt(questions.getCorrect_answer().length);
btnOption1.setText(questions.getAnswers()[current_question_num][random_num1]);
// I AM TRYING TO  REMOVE THE ITEM WHICH HAS BEEN SELECTED FROM THE 2D ARRAY I HAVE

this is the 2d array i have:

public String answers[][] ={
            {"23","12","14","15"},
    };