Task: Please answer the multiple choice question.
Question: Which molecule has the highest LD50 in rats (oral exposure)?
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=[N+]([O-])c1ccc2ccccc2c1
b: Nc1ccc(Br)cc1
c: O=Nc1ccc(N=O)cc1
d: CN(C)N=Nc1ccc(C(=O)O)cc1
e: O=C(O)c1cc(S(=O)(=O)O)ccc1O
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}