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 CCc1ccc(C)[n+]([O-])c1
b O=C(O)C1CCc2cc(C3CCCCC3)ccc21
c COC(=O)c1ccccc1N=CC(C)Cc1ccc(C(C)(C)C)cc1
d CCOC(=O)C(C)(CC)Oc1ccc(Cc2ccc(Cl)cc2)cc1
Answer: d
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}