TASK DEFINITION: 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.
PROBLEM: Question: What does the esophagus produce for lubrication? Answer: mucous

SOLUTION: Mucous does the esophagus produce for lubrication.

PROBLEM: Question: In what form is atmospheric sulfur found? Answer: sulfur dioxide (so2)

SOLUTION: In sulfur dioxide (so2) form is atmospheric sulfur found.

PROBLEM: Question: Why did people stop adding lead to gasoline? Answer: environmental pollution

SOLUTION:
People stopped adding lead to gasoline because of environmental pollution.