Task: Please answer the multiple choice question.
Question: Which molecule has the highest acute oral toxicity (LD50 in rats)?
Constraint: Even if you are not sure, you must pick either a, b, c, or d without using any other words.
Options:
a. Oc1c(Cl)c(Cl)cc(Cl)c1Cc1c(Cl)cc(Cl)c(Cl)c1O
b. CN1CCC23c4c5ccc(O)c4OC2C(O)C=CC3C1C5
c. CC=C1CC(C)C(O)(CO)C(=O)OCC2=CC[N+]3([O-])CCC(OC1=O)C23
d. CCCC1=NN(c2ccccc2)C(=O)C1C=O
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}