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 other words.
Options:
a. C=CC(=C)CCCC(C)(C)OC(C)=O
b. O=c1[nH]cc(N(CCCl)CCCl)c(=O)[nH]1
c. CN(C)C(=O)Nc1ccc(-n2nc(C(C)(C)C)oc2=O)c(Cl)c1
d. CC1COC(c2ccccc2)O1
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}