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. CN(C)N=Nc1ccc(I)cc1
b. Nc1ccc(Oc2ccc(S(=O)(=O)c3ccc(Oc4ccc(N)cc4)cc3)cc2)cc1
c. CCOc1ccc(C=O)cc1
d. O=C(O)c1cc([N+](=O)[O-])cc([N+](=O)[O-])c1O
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}