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, or d without using any other words.
Options:
a CN(Cc1ccccc1)N=O
b NC(=O)c1cc([N+](=O)[O-])cc([N+](=O)[O-])c1
c CC(C)c1cccc(C(C)C)c1N=C=O
d O=c1[nH]c2cc(Br)ccc2o1
Answer: c
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}