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 additional words.
Options:
a. O=[N+]([O-])c1ccc(OP(=O)(OCCCl)OCCCl)cc1
b. CN(C)c1ccccc1
c. CC(C)(OO)c1ccccc1
d. O=C(CN1CC1)NCCCCCCCCNC(=O)CN1CC1
Answer: a
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}