Task: Please answer the multiple choice question.
Question: Which molecule has the highest acute oral toxicity rat LD50?
Constraint: Even if you are uncertain, you must pick either a, b, c, or d without using any other words.
Options:
a. CCON=C(OC(=O)c1ccccc1)c1c(OC)ccc(Cl)c1OC
b. Cc1ccccc1NC(=N)Nc1ccccc1C
c. O=[N+]([O-])N=C1NCCN1Cc1ccc(Cl)nc1
d. O=C(NC1CC1)OCC(O)C1COc2ccccc2O1
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}