Task: Please answer the multiple choice question.
Question: Which molecule has the highest rat LD50 (oral exposure)?
Constraint: Even if you are uncertain, you must pick either a, b, c, or d without using any additional words.
Options:
a: CC(C)Nc1nc(NC(C)C)nc(N(C)C#N)n1
b: S=C1NCCNC(=S)S1
c: C=C1CCC2CC1C2(C)C
d: O=C(O)Cc1ccc2c(c1)OCc1ccccc1C2=O
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}