For the sentence:
Either the method used by the student or the techniques used by the teacher __________ a re-examination before we move ahead.
Will we use 'need' or 'needs' for the blank?
On reading the sentence for the first time, I thought it would be 'need'. But I am not sure if the verb has to comply with the first part or the second part, where 'either' is concerned.
So what should be the answer?