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 other words.
Options:
[a] CCOP(=O)(OCC)SC
[b] c1nc(NC2CC2)c2ncn(CC3CC3)c2n1
[c] CC(=O)C1=C(O)C2C3c4c[nH]c5cccc(c45)CC3C(C)(C)N2C1=O
[d] CC=CC(=O)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}