Task: Please answer the multiple choice question.
Question: Which molecule has the highest rat LD50 (oral exposure)?
Constraint: Even if you are uncertain, you must pick either a, b, c, d, or e without using any other words.
Options:
a: O=C(c1ccccc1)C(O)c1ccccc1
b: CCSP(=O)(Oc1cnn(C)c(=O)c1OC)OC(C)C
c: CC(C)OP(C)(=S)Oc1cc(Cl)c(Br)cc1Cl
d: CCCCCC(=O)c1ccc(N)cc1
e: CCCCCCCCc1ccc(C(CBr)OCCCC)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}