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%
75%
3%
6%
29
flagthe Netherlands
0%
70%
17%
5%
17
flagGreece
17%
69%
4%
8%
23
flagItaly
8%
66%
20%
4%
24
flagSwitzerland
13%
60%
13%
13%
15
flagPoland
12%
55%
13%
18%
4708
flagGermany
13%
55%
13%
16%
269
flagAustria
16%
55%
4%
23%
43
flagAustralia
16%
53%
9%
20%
43
flagFrance
7%
53%
15%
23%
13
flagthe United Kingdom
12%
52%
14%
20%
140
flagthe Philippines
6%
51%
12%
27%
33
flagIndia
6%
46%
19%
26%
415
flagMalaysia
20%
40%
6%
33%
15
flagthe United States
14%
38%
15%
31%
164
flagthe United Arab Emirates
16%
33%
8%
41%
12
flagPakistan
9%
30%
21%
33%
42
flagNigeria
7%
28%
26%
35%
42
flagCanada
30%
23%
7%
38%
13