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] NCC1CCCCO1
[b] COCc1cc(C(C)(C)C)c(O)c(C(C)(C)C)c1
[c] O=[N+]([O-])c1c(Cl)c(Cl)cc(Cl)c1Cl
[d] CCCN(CCC)c1c([N+](=O)[O-])cc(C)cc1[N+](=O)[O-]
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}