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=C=NCCOC(=O)C1C2C=CC(C2)C1C(=O)OCCN=C=O
b CCCCCc1cc(O)c2c(c1)OC(C)(C)C1CC=C(C)CC21
c CC(=O)Oc1c(Br)cc(Cl)cc1C(=S)Nc1ccc(Br)cc1
d Cc1nccnc1C
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}