Task: Please answer the multiple choice question.
Question: Which molecule has the highest LD50 in rats (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: CCOC(C1=NCC(C)(C)CN1)c1cccc2ccccc12
b: CC1(C)Cc2cccc(OC(=O)NCSc3ccc(Cl)cc3)c2O1
c: CCC(C(c1ccc(Cl)cc1)c1ccc(Cl)cc1)[N+](=O)[O-]
d: CCCn1cnc2c1c(=O)n(CCCCC(C)=O)c(=O)n2C
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}