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) COc1ccc(C2OCOCC2C)cc1
(b) O=C(Nc1ccc(Br)cc1)c1cc(Br)cc(Br)c1O
(c) C1C2CC3OC3C2CC2OC12
(d) O=[N+]([O-])c1cc(C2CCCCC2)c(O)c([N+](=O)[O-])c1
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}