In this task, you are given a question and an answer, you would be asked to create the sentence based on the Question-Answer provided. It should be contained within the Question-Answer provided.

Question: When blood vessels in the head dilate, what kind of severe headache can occur? Answer: migraine
When blood vessels in the head dilate, a migraine, a severe headache, can occur.

Question: What is one problem with current methods of aluminum production? Answer: environmental contaminants
Environmental contaminants is one problem with current methods of aluminum production.

Question: What happens to a chain of amino acids after it reaches a stop codon? Answer: released from the ribosome

When a chain of amino acids reaches a stop codon, released from the ribosome.