Task: Please answer the multiple choice question.
Question: Which molecule has the highest acute oral toxicity (LD50 in rats)?
Constraint: Even if you are not sure, you must pick either a, b, c, or d without using any additional words.
Options:
a. COc1c2ccoc2cc2oc(C)cc(=O)c12
b. COP(=S)(OC)Oc1ccc(SC)c(C)c1
c. NC1=NCC(CN2CCN(c3ccccc3)CC2)O1
d. O=C(O)CSc1cccc2cccc(CCl)c12
Answer: b
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}