Definition: Given a scientific passage and an answer, generate a question for the given answer.
Input: Passage: Sulfuric acid is produced in extremely large quantities in the United States (about 40 million tons/year). This material is manufactured by oxidizing sulfur to form sulfur trioxide. The SO 3 is then dissolved in water to form the sulfuric acid. Most of the sulfuric acid produced is used in fertilizers. This acid is also found in lead-acid car batteries. Answer: water
Output:
What is sulfur trioxide dissolved in to form sulfuric acid?