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 other words.
Options:
a) O=C(O)c1c(Cl)c(Cl)c(Cl)c(Cl)c1C(=O)Nc1cccc(Cl)c1Cl
b) O=C(CCCCC(=O)OC1CCCCC1)OC1CCCCC1
c) CC(C(=O)O)c1ccc(-c2cn3ccccc3n2)cc1
d) COc1ccc2c(c1)c(CC(=O)Oc1ccc(NC(C)=O)cc1)c(C)n2C(=O)c1ccc(Cl)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}