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, or d without using any other words.
Options:
a: CCCCC(CC)COC(=O)CCCCCCCCC(=O)OCC(CC)CCCC
b: CNC(=O)CCS
c: O=C1C=CC(=O)N1c1cccc(N2C(=O)C=CC2=O)c1
d: CCOC(=S)SSSC(=S)OCC
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}