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, d, or e without using any other words.
Options:
a. CCNC1=Nc2ccc(Cl)cc2C(C)(c2ccccc2)O1
b. CCCCOCCOCCOCCCC
c. CN(C)CCCN
d. O=c1[nH]cc(N(CCCl)CCCl)c(=O)[nH]1
e. CN(C)c1ccc(N=Nc2cccc(Br)c2)cc1
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}