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 additional words.
Options:
[a] COP(C)(=S)SCn1c(=O)oc2cc(Cl)cnc21
[b] O=C1CCOc2ccccc21
[c] CCCCSc1ccc(C(SCCN(C)C)c2ccccc2)cc1
[d] C=CC(=O)OCC1CC2C=CC1C2
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}