Task: Please answer the multiple choice question.
Question: Which molecule has the highest acute oral toxicity (LD50 in rats)?
Constraint: Even if you are uncertain, you must pick either a, b, c, d, or e without using any other words.
Options:
a: O=[N+]([O-])C(Br)(CO)CO
b: C=CCOC(=O)CCCCCCCC1OC1CCCCCCCC
c: CCCCSSC(Cl)C(Cl)Cl
d: O=C(CCCl)OC1=C(OC(=O)CCCl)C(=O)OC1=O
e: C=CCSC(=S)SC(Cl)(Cl)Cl
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}