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: CC12CCC3c4ccc(O)cc4CCC3C1CCC2OC(=O)COC(=O)CCCc1ccc(N(CCCl)CCCl)cc1
b: CN1C(C(=O)Nc2ccccn2)=C(OC(=O)C23CC4CC(CC(C4)C2)C3)c2sc(Cl)cc2S1(=O)=O
c: c1ccc(-c2ccccc2-c2ccccc2)cc1
d: CN1CCCC1=O
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}