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 additional words.
Options:
a CCC(C)(C)NC(N)=NC#N
b CC1OC(OC2C(C)OC(OC3C(C)OC(OC4CCC5(C)C(CCC6C5CCC5(C)C(C7=CC(=O)OC7)C(OC=O)CC65O)C4)CC3OC=O)CC2OC=O)CC(OC=O)C1OC=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}