Task: Please answer the multiple choice question.
Question: Which molecule has the highest acute oral toxicity rat LD50?
Constraint: Even if you are uncertain, you must pick either a, b, c, d, or e without using any other words.
Options:
a. CNC(=O)Oc1cccc2sccc12
b. CCN(C)CCC(CC=C(C)C)(C(N)=O)c1cccc2ccccc12
c. CC(C=O)=Cc1ccccc1
d. COP(=O)(OC)OC(=CBr)c1ccc(Cl)cc1Cl
e. O=[N+]([O-])c1ccc(O)c(CNCCO)c1
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}