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: CC(=O)Nc1ccc(S(=O)(=O)Nc2cc(C)on2)cc1
b: ClC1=C(Cl)C2(Cl)C(CBr)CC1(Cl)C2(Cl)Cl
c: O=C(O)Cc1ccc2c(c1)C(=O)c1ccccc1CO2
d: CCC=C1OC(=O)c2ccccc21
Answer: b
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}