Recently, animal experiments have found that adding a certain amount of bitter melon water extract to the normal diet can reduce hyperglycemia in type II diabetic mice. This is because bitter melon contains an insulin-like substance that can lower blood sugar. Some people According to this, people with type 2 diabetes eat more bitter melon to help lower blood sugar levels. If one of the following is true, the above argument is most questioned? ['Momordica charantia is low in sugar and has little effect on blood sugar.', 'Momordica charantia contains very little water extract.', 'Bitter melon water extract may cause a slight decrease in total serum protein.', 'Bitter melon water extract has no significant effect on blood glucose in type I diabetic mice.']