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) O=C(C=Cc1ccccc1)OCCc1ccccc1
b) O=c1ccc2cc3ccoc3c(O)c2o1
c) CCC=CC1C(C(=O)OCc2coc(Cc3ccccc3)c2)C1(C)C
d) CCCN(CCC)CC(=O)NN=Cc1ccc([N+](=O)[O-])o1
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}