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The second basic principle of preventing infectious disease, keeping the immune system working, is:
ADaily antibiotics
BStrict isolation
CRegular fasting
DProper nourishment
Answer & Solution
Correct answer: D. Proper nourishment
1. Immune cells kill most infections early.
2. They need proper and sufficient food.
3. Poor nourishment weakens immunity.
_Source: NCERT Class 9 Science, Chapter 13, Why Do We Fall Ill._
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