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 additional words.
Options:
a) CNC(=N)NC(=O)Nc1c(C)cccc1C
b) O=C(Cc1c[nH]c2ccccc12)NN1C(=O)CSC1=S
c) [O-][n+]1onc2c1c1no[n+]([O-])c1c1no[n+]([O-])c21
d) c1ccc(Nc2ccc3ccccc3c2)cc1
Answer: c
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}