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What substance has the lowest value of LD50 (median lethal dose)?

Sarin

Botox

Ricin

Arsenic

The value of LD50 for a substance is the dose required to kill half the members of a tested population after a specified test duration. Botox is the most acutely lethal toxin known, with an estimated human LD50 of 1.3–2.1 ng/kg intravenously or intramuscularly and 10–13 ng/kg when inhaled.

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Answers by country

Republic of Ireland

13%

71%

5%

9%

52

the Netherlands

3%

70%

13%

10%

30

Greece

16%

70%

4%

8%

24

Italy

5%

58%

23%

11%

34

Poland

12%

56%

12%

18%

6823

France

11%

55%

16%

16%

18

Switzerland

8%

51%

21%

19%

47

Australia

11%

50%

7%

29%

68

Germany

14%

49%

14%

19%

703

the United Kingdom

12%

46%

17%

22%

234

Austria

15%

45%

13%

25%

112

the Philippines

5%

45%

11%

35%

51

Canada

14%

44%

16%

24%

50

India

5%

43%

20%

28%

605

the United Arab Emirates

9%

40%

9%

40%

22

the United States

13%

39%

17%

28%

299

Pakistan

6%

37%

18%

33%

72

Malaysia

19%

33%

9%

38%

21

Ghana

17%

30%

26%

21%

23

Nigeria

10%

28%

24%

33%

128

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