it's not a matter of who would be at fault; it's the fact that if it turns out to be the case that they only allow me to enter 3 or 4, then my application would be rendered inaccurate by virtue of this inadequacy. I feel it would be my obligation to communicate this issue with amcas to have the max number expanded to accommodate quintuple/quadruple majors. it would be like if i asked you what colors are the american flag, and you answered 'red'. this response would be inaccurate, as indeed the american flag is red, white, and blue. furthermore, to officiate that answer (ie to submit the amcas with 3 rather than 5 majors) would be gravely dishonest and would be very deceptive to adcoms, who are looking for the full truth, not part of it.