Task: Please answer the multiple choice question.
Question: Which molecule has the highest LD50 in rats (oral exposure)?
Constraint: Even if you are uncertain, you must pick either a, b, c, or d without using any additional words.
Options:
[a] C=CC(C)(CCC=C(C)C)OC(=O)c1ccccc1N
[b] O=C=Nc1ccc(Cl)cc1
[c] CN(C)C(=O)Nc1cccc(OC(=O)NC(C)(C)C)c1
[d] CCCSc1cc(Oc2ccc([N+](=O)[O-])cc2)ccc1Cl
Answer: b
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}