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 additional words.
Options:
a) O=C(CN1CC1)NCCCCCCCCNC(=O)CN1CC1
b) CCOP(=O)(OCC)C(SCC)(Sc1ccccc1)P(=O)(OCC)OCC
c) CCOP(=S)(OCC)Oc1ccc(S(C)=O)cc1
d) CN1CCC23CCCCC2C1Cc1ccc(O)cc13
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}