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: CCCCSc1nc2ccccc2s1
b: O=C=NCCOC(=O)C1CC=CCC1C(=O)OCCN=C=O
c: CC1(C)CC(NCCC(=O)NC2CC(C)(C)NC(C)(C)C2)CC(C)(C)N1
d: O=C=NCCOC(=O)C1CC=CCC1C(=O)OCCN=C=O
e: CCCCCC(C)(O)CC
Answer: b, d
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}