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: Cn1c(=O)c2c(ncn2C)n(C)c1=O
b: CC1(C)Cc2cccc(OC(=O)NCSc3ccc(Cl)cc3)c2O1
c: CCNc1nc(NCC)nc(SC)n1
d: CC(N)C1CCC(c2ccccc2)CC1
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}