Task: Please answer the multiple choice question.
Question: Which molecule has the highest rat LD50 (oral exposure)?
Constraint: Even if you are uncertain, you must pick either a, b, c, or d without using any other words.
Options:
a: CCOC(=O)C1=CN(C(=O)c2ccccc2)C2CCCC(C)N2C1=O
b: OC1CCCc2ccccc21
c: CSC(C)=NOC(=O)N(C)SN(C(C)C)P1(=S)OCC(C)(C)CO1
d: O=c1[nH]c(=O)n(CC2CC2)c2nc[nH]c12
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}