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 additional words.
Options:
a. COP(=S)(OC)Oc1ccc([N+](=O)[O-])c(C)c1
b. CCOP(=S)(OCC)ON=C(C#N)c1ccccc1
c. CCOP(=S)(OC)Oc1cc(Cl)c(Cl)cc1Cl
d. O=C(c1ccc(O)cc1O)c1ccc(O)cc1O
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}