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) O=C(OC1CCCCC1)c1ccccc1C(=O)OC1CCCCC1
b) O=C(O)c1cc2ccccc2c(Cc2c(O)c(C(=O)OCCOCCN3CCN(C(c4ccccc4)c4ccc(Cl)cc4)CC3)cc3ccccc23)c1O
c) c1ccc(-c2nnco2)cc1
d) CCc1ccc(C)[n+]([O-])c1
Answer: a
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}