Task: Please answer the multiple choice question.
Question: Rank these molecules from lowest to highest acute oral toxicity (LD50 in rats).
Constraint: You must select all options from a, b, c, or d without using any other words.
Options:
a) O=C=Nc1ccc([N+](=O)[O-])cc1
b) O=C(O)c1cc(Cl)cc([N+](=O)[O-])c1Cl
c) CN(C)C(=O)Oc1cccc2sccc12
d) CCCCOC(NC(=O)c1ccccc1O)C(Cl)(Cl)Cl
Answer: a
Task: Please answer the multiple choice question.
Question: Rank these molecules from lowest to highest {acute_toxicity__names__noun}.
Constraint: You must select all options from {%multiple_choice_enum%2-5%aA1} without using any {#other|additional!} words.
Options:
{SMILES%acute_toxicity%}
Answer: {%multiple_choice_result}