Task: Please answer the multiple choice question.
Question: Which molecule has the highest rat LD50 (oral exposure)?
Constraint: Even if you are not sure, you must pick either a, b, c, or d without using any other words.
Options:
a: Cc1cccc(C)c1N(CCCC(=O)O)C(=O)c1ccc(Cl)cc1
b: CN(c1ccc2c(O)c(N=Nc3ccc4c(S(=O)(=O)O)cccc4c3S(=O)(=O)O)c(S(=O)(=O)O)cc2c1)c1nc(Cl)nc(Cl)n1
c: C1CN2CCN1CC2
d: O=S1(=O)CCN(c2ccccc2)CC1
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}