Task: Question Answering
Input (English): Question: The cause of phenylketonuria is a hereditary deficit of: 
 Options:  <1> Homogentisate dioxygenase. <2> Tyrosine aminotransferase. <3> Phenylalanine hydroxylase. <4> Dihydropteridine oxidase. <5> Tryptophan dioxygenase.
Output (English): 3