Task: Please answer the multiple choice question.
Question: Which molecule has the highest acute oral toxicity (LD50 in rats)?
Constraint: Even if you are uncertain, you must pick either a, b, c, or d without using any other words.
Options:
a: COP(=O)(Oc1ccc([N+](=O)[O-])c(Cl)c1)SC
b: N#Cc1ccccc1C#N
c: O=S(=O)(Cl)c1ccc(Cl)cc1
d: OCCOCCOCCOCCOc1ccccc1
Answer: b
Task: Please answer the multiple choice question.
Question: Which molecule has the highest {acute_toxicity__names__noun}?
Constraint: Even if you are {#uncertain|not sure!}, you must pick either {%multiple_choice_enum%2-5%aA1} without using any {#other|additional!} words.
Options:
{SMILES%acute_toxicity%}
Answer: {%multiple_choice_result}