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, d, or e without using any other words.
Options:
a.) O=C(NCc1cccnc1)Nc1ccc([N+](=O)[O-])cc1
b.) S=C(C=Cc1ccc2c(c1)OCO2)N1CCOCC1
c.) CC(C)CC(C)Nc1ccc(Nc2ccccc2)cc1
d.) ClCCCl
e.) CCCCC(C)CC(O)C=CC1C(O)CC(=O)C1CC(=O)CCCCC(=O)OC
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}