What is the hygiene hypothesis?
A. People with better hygiene (such as taking regular baths and brushing teeth) tend to get ill less often than people with poorer hygiene.
B. Living in a cleaner environment lowers exposure to germs and thus the immune system is less able to distinguish between harmful substances and less harmful irritants, leading to an overreaction to harmless irritants.
C. Increasing hygiene activities (such as bathing and brushing teeth) actually causes an increase in illness because bacteria can enter the system during the hygiene activities.
D. People with poorer hygiene in childhood tend to continue to have health problems later in life, even if they change their hygiene habits later on in life.
Answer: B
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