Случайный вариант ответа из списка без повторений

from turtle import color
import openpyxl
import random
from tkinter import *
from tkinter import messagebox
 
mainWindow = Tk()
 
mainWindow.title("Test")
mainWindow.geometry("900x900")
wookbook = openpyxl.load_workbook("voprosy.xlsx")
worksheet = wookbook.active
 
i = 1
while i <= 15:
    b = random.randint(1,15)
   
    def level_i(): 
        
        question = Label(mainWindow,text = (worksheet.cell(row = b, column = 1).value),font = "Calibri 20")
        c = random.randint(2,5)
        btn1 = Button(mainWindow,text = (worksheet.cell(row=b,column=c).value),font = "Calibri",background = "#1E90FF",foreground = "#FFFFFF",width= "200", command = lambda : clickCorrectButton())
        c1 = random.randint(2,5)
        btn2 = Button(mainWindow,text = (worksheet.cell(row=b,column=c1).value),font = "Calibri",background = "#1E90FF",foreground = "#FFFFFF",width= "200")
        c2 = random.randint(2,5)
        btn3 = Button(mainWindow,text = (worksheet.cell(row=b,column=c2).value),font = "Calibri",background = "#1E90FF",foreground = "#FFFFFF",width= "200")
        c3 = random.randint(2,5)
        btn4 = Button(mainWindow,text = (worksheet.cell(row=b,column=c3).value),font = "Calibri",background = "#1E90FF",foreground = "#FFFFFF",width= "200")
    
        def clickCorrectButton():
            i=i+1
            messagebox.showinfo("Правильно!", "Вы ответили верно!")
            level_i()
    
        question.pack() 
        btn1.pack()
        btn2.pack()
        btn3.pack()
        btn4.pack()