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. O=C(C=Cc1ccccc1)OCC=Cc1ccccc1
b. Cc1nc([N+](=O)[O-])cn1-c1ccc([N+](=O)[O-])cc1
c. O=C(O)Cc1ccc(C2CCCCC2)c(Cl)c1
d. Cc1ccccc1-n1c(C)nc2ccc(N)cc2c1=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}