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.

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


[Q]: Question: What is the hollow and muscular balloon-shaped organ that collects urine? Answer: urinary bladder
[A]: The urinary bladder is the hollow and muscular balloon-shaped organ that collects urine.


[Q]: Question: Approximately how many weeks does the fetal period last? Answer: 30 weeks
[A]:
The fetal period lasts approximately 30 weeks weeks.