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 or b without using any other words.
Options:
a. CON=C(C)C(=NOC(=O)N(C)SN(C)C(=O)Oc1cccc2c1OC(C)(C)C2)C(=O)N(C)C
b. COP(=O)(OC)SCN1C(=O)c2ccccc2C1=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}