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, d, or e without using any other words.
Options:
a O=C(CCCl)NCc1ccccc1
b CCN(CC)C(=O)c1cccc(C)c1
c CCOP(=S)(Oc1ccc(C#N)cc1)c1ccccc1
d C=C(C)C(=O)Nc1ccc(Cl)c(Cl)c1
e Nc1cc(N2CCCCC2)nc(N)[n+]1[O-]
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}