Detailed Instructions: 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'.
See one example below:
Problem: Question: A 13-year-old girl is operated on due to Hirschsprung illness at 3 months of age. Which of the following tumors is more likely to be present? 
 Options: <1> Abdominal neuroblastoma <2> Wilms tumor <3> Mesoblastic nephroma <4> Familial thyroid medullary carcinoma.
Solution: 2
Explanation: The answer to the given question should be a tumor, therefore Wilms tumor is the correct answer for the given question.

Problem: 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.
Solution:
3