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
14%
75%
3%
7%
28
flagGreece
14%
71%
4%
9%
21
flagthe Netherlands
0%
71%
14%
7%
14
flagItaly
8%
66%
20%
4%
24
flagSwitzerland
13%
60%
13%
13%
15
flagGermany
12%
57%
13%
15%
230
flagAustralia
12%
56%
9%
21%
41
flagPoland
12%
54%
13%
19%
4453
flagthe United Kingdom
11%
54%
16%
18%
124
flagFrance
7%
53%
15%
23%
13
flagAustria
18%
52%
5%
23%
38
flagthe Philippines
6%
48%
13%
31%
29
flagIndia
6%
47%
18%
26%
386
flagthe United States
13%
38%
16%
31%
160
flagMalaysia
15%
38%
7%
38%
13
flagPakistan
8%
30%
25%
30%
36
flagthe United Arab Emirates
20%
30%
10%
40%
10
flagNigeria
5%
29%
29%
35%
34
flagCanada
33%
25%
8%
33%
12