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, or d without using any other words.
Options:
a. O=C(Nc1ccccn1)NC1CCCCC1
b. CCCCOP(=O)(OCCCC)Oc1ccc2c(C)c(Cl)c(=O)oc2c1
c. CN(C)C(=O)N(C)C
d. CC(NC(C)c1ccccc1)c1ccccc1
Answer: d
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}