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, or d without using any other words.
Options:
a. CCCCCCCCCc1cc(C)cc(Cc2cc(C)cc(CCCCCCCCC)c2O)c1O
b. CCOP(=S)(OCC)SC(c1ccccc1)c1ccc(Cl)cc1
c. O=C1OC(=O)C2CC(Cl)=CCC12
d. CSc1nc(N=[N+]=[N-])nc(NC(C)C)n1
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}