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 additional words.
Options:
a. CCCC(Cc1ccccc1)N1CCCC1
b. COc1cc(Oc2ccc(Cl)cc2Cl)ccc1[N+](=O)[O-]
c. O=C(O)COc1ccc2ccccc2c1
d. CCOP(=S)(CC)Oc1ccc([N+](=O)[O-])cc1Cl
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}