Task: Please answer the multiple choice question.
Question: Which molecule has the highest acute oral toxicity rat LD50?
Constraint: Even if you are uncertain, you must pick either a, b, c, d, or e without using any other words.
Options:
a: CCCOCCOC(=O)C1=C(C)NC(C)=C(C(=O)OCCOCCC)C1c1cccc([N+](=O)[O-])c1
b: CCCC=CCO
c: CCOP(=O)(CCCl)OCC
d: C=CC(=O)OCCOC
e: CCCCC(CC)COP(=O)(O)OCC(CC)CCCC
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}