Task: Please answer the multiple choice question.
Question: Which molecule has the highest acute oral toxicity (LD50 in rats)?
Constraint: Even if you are uncertain, you must pick either a, b, c, or d without using any other words.
Options:
a. Cc1c([N+](=O)[O-])cc(N)cc1[N+](=O)[O-]
b. Cc1cc(C)cc(O)c1
c. Oc1c(Br)cc(Br)cc1Br
d. COc1ccc(C2=Cc3ccccc3OC2c2ccc(OCCN3CCCCC3)cc2)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}