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 additional words.
Options:
(a) CCOP(=S)(Oc1cnn(C)c(=O)c1)OC(C)C
(b) O=[N+]([O-])c1cc(C(F)(F)F)cc([N+](=O)[O-])c1Cl
(c) CCOP(=O)(OCC)Sc1ccc([N+](=O)[O-])cc1
(d) CCC(C)c1ccc(Cl)c(OC(=O)NC)c1
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}