Task: Please answer the multiple choice question.
Question: Which molecule has the highest acute oral toxicity rat LD50?
Constraint: Even if you are not sure, you must pick either a, b, c, or d without using any other words.
Options:
a) CC(=O)CC(c1ccc(Cl)cc1)c1c(O)c2ccccc2oc1=O
b) COC(=O)Nc1nc2cc(Oc3ccc4[nH]c(NC(=O)OC)nc4c3)ccc2[nH]1
c) CCOC(=O)N(C)SN(C)C(=O)ON=C(C)SC
d) COP(=S)(OC)SC(C)CSCC(C)SP(=S)(OC)OC
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}