Damaged nerves in the spinal cord do not regenerate themselves naturally, nor even under the spur of nerve-growth stimulants. The reason, recently discovered, is the presence of never-growth inhibitors in the spinal cord. Antibodies that deactive those inhibitors have now been developed. Clearly, then,nerve repair will be a standard medical procedure in the foreseeable future.
which of the following, if true, casts the most serious doubt on the accuracy of the prediction above?
(a) Prevention of the regeneration of damaged nerves is merely a by-product of the main funcation of the substances inhibiting nerve growth.
(b)Certain nerve-growth stimulatants have sumilar chemical structures to those of the antibodies against nerve-growth inhibitors.
(c)Nerves in the brain are similar to nerves in the spinal cord in their inability to regenerate themselves naturally.
(d)Researcher have been able to stimulate the growth of nevers not located in the spinal cord by using only nerve-growth stimulatants.
(e)Deactivating the substances inhibiting never growth for an extended period would require a steady supply of antibodies.
