Task: Please answer the multiple choice question.
Question: Which molecule has the highest acute oral toxicity rat LD50?
Constraint: Even if you are not sure, you must pick either a, b, c, or d without using any other words.
Options:
a: CCNc1nc(Cl)nc(NC(C)(C)C)n1
b: COP(=O)(N=C1SCC(C)S1)OC
c: Cc1ccccc1-c1nc2c(N)nc(N)nc2nc1N
d: COc1ccccc1NC(=O)CNC(=O)Cc1ccc(C(=O)c2ccc(C)cc2)n1C
Answer: b
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}