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, b, c, or d without using any other words.
Options:
a O=c1[nH]cnc2c1ncn2C1OC(COP(=O)(O)O)C(O)C1O
b CCP(=O)(OC)Oc1ccc([N+](=O)[O-])cc1
c CCOC(=O)c1ccc([N+]([O-])=Cc2ccc(N(CC)CC)cc2)cc1
d CCC(C)c1cccc(OC(=O)NC)c1
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}