(Hint: the correct answer has nothing to do with dehydration)?

enzymes are basically protines. protein can carry out particular function only when their tertiary (or in some cases, quaternary) structure is maintained. most of the body proteins can retain their tertiary structure upto 40*C, beyond which they undergo denaturation n hence deactivation. as enzymes r the biocatalyst without which normal body metabolism cannot take place, hence the prson died.