Fact 1: Astronauts require preserved food for extended flights. Fact 2: An astronaut is a scientist who is a space explorer. Given the two facts above, answer the question "A scientist who is a space explorer requires what for extended flights?" with the following options: - preserved food - salt and water. - hydration - a hydraulic system - useless heavy objects - short-lived food - hydrate their cells - perishable food
A:
preserved food