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 additional words.
Options:
[a] C[Si]1(C)N[Si](C)(C)N[Si](C)(C)N[Si](C)(C)N1
[b] CC(C)OC(=O)C(O)(c1ccc(Br)cc1)c1ccc(Br)cc1
[c] CN(CCCn1cnc2c1c(=O)n(C)c(=O)n2C)c1ccccc1
[d] OCC1CCc2cc(C3CCCCC3)ccc21
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}