Task: Please answer the multiple choice question.
Question: Which molecule has the highest rat LD50 (oral exposure)?
Constraint: Even if you are not sure, you must pick either a, b, c, or d without using any additional words.
Options:
a. COC(=O)c1ccccc1C(=O)OC
b. CCOC(C1=NCC(C)(C)CN1)c1ccc(OC)c(F)c1
c. CCC(C(=O)c1ccc2[nH]c(=O)ccc2c1)N1CCN(c2cccc(Cl)c2)CC1
d. CC(C)Cc1ccc2ccccc2n1
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}