certainly makes litte sense. Perhaps the answer that they are looking for is that the controller should confirm your squawk. I think its in MATS pt 1 that it says if an aircraft squawks 7500 a controller should ask the pilot to confirm he has selected the correct squawk, but not to mention the 7500 squawk, with the 'no mode A interpretation' statement trying to make the question less complicated by removing CCDS from the equation.