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

Sarin
Botox
Ricin
Arsenic
answers
flagRepublic of Ireland
13%
71%
5%
9%
52
flagthe Netherlands
3%
70%
13%
10%
30
flagGreece
16%
70%
4%
8%
24
flagItaly
5%
58%
23%
11%
34
flagPoland
12%
56%
12%
18%
6794
flagFrance
11%
55%
16%
16%
18
flagSwitzerland
8%
51%
21%
19%
47
flagAustralia
11%
50%
7%
29%
68
flagGermany
14%
49%
14%
19%
701
flagthe United Kingdom
12%
46%
17%
22%
234
flagAustria
14%
45%
13%
26%
111
flagthe Philippines
5%
45%
11%
35%
51
flagCanada
14%
44%
16%
24%
50
flagIndia
5%
43%
20%
28%
605
flagthe United Arab Emirates
9%
40%
9%
40%
22
flagthe United States
13%
39%
17%
28%
299
flagPakistan
6%
37%
18%
33%
72
flagMalaysia
19%
33%
9%
38%
21
flagGhana
17%
30%
26%
21%
23
flagNigeria
10%
28%
24%
33%
128