Teacher:Given scientific fact as input, generate the question from this fact such that it can be answered from the input.
Teacher: Now, understand the problem? Solve this instance: Carbon dioxide molecules consist of a central carbon atom bonded to two oxygen atoms.
Student:

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
Carbon dioxide molecules consist of a central carbon atom bonded to how many oxygen atoms?