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] S=C(C=Cc1ccc2c(c1)OCO2)N1CCOCC1
[b] CCOC(=O)CC[Si](C)(OCC)OCC
[c] CCCCCOc1ccc(C2SC(=O)NC2=O)cc1OCC
[d] C=CCOC(C)=O
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}