Definition: In this task, you are given a multiple-choice question about healthcare. Answer the question based on your information and classify your answers into '1', '2', '3', and '4'.
Input: Question: From what compound and where mainly melatonin is produced ?: 
 Options:  <1> From tyrosine in the skin. <2> From tryptophan in the skin <3> From tryptophan in the pineal gland. <4> From tyrosine in the pituitary gland. <5> From tyrosine in the pineal gland.
