Task: Please answer the multiple choice question.
Question: Which molecule has the highest acute oral toxicity (LD50 in rats)?
Constraint: Even if you are not sure, you must pick either a, b, c, or d without using any additional words.
Options:
a) CCCCCCCCCCCCCCCCCC1=NC(C)(C)CC(C)N1
b) CCCCCC(C=O)=Cc1ccccc1
c) O=C=NCc1cccc(CN=C=O)c1
d) CCCCC(CC)COC(=O)c1cccc(C(=O)OCC(CC)CCCC)c1
Answer: c
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}