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 additional words.
Options:
a: COP(=S)(OC)SCc1nc(N)nc(N)n1
b: CCOC(=O)C(C)Oc1ccc(Oc2nc3ccc(Cl)cc3s2)cc1
c: Fc1ccc(C(c2ccccc2)(c2ccccc2F)n2ccnc2)cc1
d: S=c1[nH]c2ccc(Cl)cc2[nH]1
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}