Task: Please answer the multiple choice question.
Question: Which molecule has the highest acute oral toxicity rat LD50?
Constraint: Even if you are uncertain, you must pick either a, b, c, or d without using any additional words.
Options:
a: Oc1ccc(-c2ccccc2)cc1CN1CCCC1
b: CCC(C(=O)O)c1ccc(N2Cc3ccccc3C2=O)cc1
c: O=C=Nc1ccc(Cc2ccc(N=C=O)cc2N=C=O)cc1
d: c1ccc(N(c2ccccc2)c2ccccc2)cc1
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}