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. CCOP(=O)(Oc1cnn(C)c(=O)c1OC)SC(C)C
b. CCCCCCCCOC(=O)c1ccccc1C(=O)OCCCCCCCC
c. CCOP(=S)(OCC)Oc1ccccc1[N+](=O)[O-]
d. CC(=O)Nc1ccc(N)cc1
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}