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, or d without using any other words.
Options:
[a] O=C1C(N(CO)C(=O)NCO)N(CO)C(=O)N1CO
[b] CCCOC(C1=NCCN1)c1ccccc1
[c] O=C1CCC(=O)N1c1cc(Cl)cc(Cl)c1
[d] O=CC(Cl)CCl
Answer: 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}