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Lead concentration in blood is considered alarming if it is

1. 20 mg/100 ml
2. 30 mg/100 ml
3. 4–6 mg/100 ml
4. 10 mg/100 ml

Correct answer: 10 mg/100 ml

Solution

Lead concentration in blood is considered alarming if it reaches 10 mg/100 ml or higher, as it can cause severe health issues, including neurological damage.

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