Task: Please answer the multiple choice question.
Question: Which molecule has the highest acute oral toxicity (LD50 in rats)?
Constraint: Even if you are not sure, you must pick either a, b, c, or d without using any other words.
Options:
a: CNC(=O)Oc1ccccc1Cl
b: Cc1cc([N+](=O)[O-])ccc1[N+](=O)[O-]
c: COP(C)(=S)Sc1ccccc1
d: CC(=O)OCC(C(OC(C)=O)c1ccccc1)[N+](=O)[O-]
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}