Read this paragraph: 'Regular exercise improves cardiovascular health, strengthens muscles, and boosts mood. Doctors recommend at least 30 minutes of moderate activity most days.' What is the main idea?
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A
Doctors set strict exercise requirements for patients.
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B
Exercise offers multiple health and mental benefits.
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C
Cardiovascular disease can be prevented with exercise.
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D
Walking for 30 minutes burns a specific number of calories.