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=c1oc(-c2ccccc2)nc2ccccc12
b) Nc1nc2cccc(Cl)c2o1
c) N#CCC[Si](Cl)(Cl)Cl
d) Cn1c([N+](=O)[O-])cnc1C=Cc1ccnc(N)n1
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}