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 CNC(=O)Oc1cccc2ccoc12
b CCc1oc2ccccc2c1CC(=NCCN1CCOCC1)NO
c CCC(C)(C)NC(N)=NC#N
d O=C(c1ccc2ccccc2n1)N1CCN=C1Nc1c(Cl)cccc1Cl
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}