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. O=C1CCCCC1
b. COCC(=O)N(C)C(=O)Oc1ccccc1OC(C)C
c. O=[N+]([O-])c1cccc(Cl)c1
d. Clc1ccccc1
e. COc1ccc([N+](=O)[O-])cc1CNCCBr
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}