The option that isn't true of the Wada test is D. It is is used before elective surgery for the treatment of epilepsy.
It should be noted that Wada test is used to evaluate how important each side of the brain is with respect to language and memory function.
In this case, the option that isn't true of the Wada test is that is is used before elective surgery for the treatment of epilepsy.
In conclusion, the correct option is D.
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