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 additional words.
Options:
a. O=C(O)C1C(=CCO)OC2CC(=O)N21
b. Fc1c(F)c(F)c2[nH]c(C(F)(F)F)nc2c1F
c. CCN(CC)C(=O)N1CCN(CC(=O)NN=Cc2ccc([N+](=O)[O-])o2)CC1
d. COP(=S)(Oc1ccc([N+](=O)[O-])cc1)Oc1ccc([N+](=O)[O-])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}