Task: Please answer the multiple choice question.
Question: Which molecule has the highest acute oral toxicity (LD50 in rats)?
Constraint: Even if you are not sure, you must pick either a or b without using any additional words.
Options:
a: CCOC(C1=NCC(C)(CC)CN1)c1cccc(Cl)c1
b: CSC(C)=NOC(=O)N(C)SN(C)C(=O)Oc1ccc(OC(=O)N(C)SN(C)C(=O)ON=C(C)SC)cc1
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}