Q: Passage: The Eiffel Tower (/ ˈaɪfəl ˈtaʊ. ər / EYE-fəl TOW-ər; French: tour Eiffel, pronounced ( tuʁ ‿ ɛfɛl) listen ) is a wrought iron lattice tower on the Champ de Mars in Paris, France. It is named after the engineer Gustave Eiffel, whose company designed and built the tower.

Question: Based on this passage, is the eiffel tower made of steel or iron? Let's give stream of consciousness first:

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.
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The important part for answering this question is: The Eiffel Tower (/ ˈaɪfəl ˈtaʊ. ər / EYE-fəl TOW-ər; French: tour Eiffel, pronounced ( tuʁ ‿ ɛfɛl) listen ) is a wrought iron lattice tower on the Champ de Mars in Paris, France. Therefore, the final answer is iron.