Some experiments have shown that okra extract, okra pigment, has a certain effect on the treatment of animal diabetes. Some people believe that okra slices soaked in water can help lower blood sugar in people with diabetes. If one of the following is true, the above argument can be questioned most? ['only using extracted, concentrated high-dose okrabin can lower blood sugar in people with diabetes.', 'It is the safest and most effective way to control blood sugar for people with diabetes.', 'Okra is effective in patients with type 2 diabetes and ineffective in patients with type 1 diabetes.', 'the dietary fiber and multivitamins in okra are not higher than those of ordinary vegetables.']