Task: Please answer the multiple choice question.
Question: Which molecule has the highest acute oral toxicity rat LD50?
Constraint: Even if you are not sure, you must pick either a, b, c, or d without using any other words.
Options:
a: Oc1ccc(-c2ccccc2)cc1CN1CCCC1
b: CC(=O)CCCCn1c(=O)c2c(ncn2C)n(C)c1=O
c: CN(C)CC(=O)NN=Cc1c(-c2ccc(Cl)cc2)nc2n1CCS2
d: O=C(O)Cc1ccc(C2CCCCC2)c(Cl)c1
Answer: d
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}