Task: Please answer the multiple choice question.
Question: Which molecule has the highest acute oral toxicity (LD50 in rats)?
Constraint: Even if you are uncertain, you must pick either a, b, c, or d without using any other words.
Options:
a: O=[N+]([O-])N=C1NCCN1Cc1ccc(Cl)nc1
b: CCOC(=O)C1CC2C=CC1C2
c: CN(C)C(=O)C(c1ccccc1)c1ccccc1
d: CN(C)c1ccc(C(=N)c2ccc(N(C)C)cc2)cc1
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}