Task: Please answer the multiple choice question.
Question: Which molecule has the highest acute oral toxicity (LD50 in rats)?
Constraint: Even if you are not sure, you must pick either a, b, c, or d without using any additional words.
Options:
a. C1CNCCN1
b. CCCCCCCCCCCC(=O)OCC(O)C1OCC(O)C1O
c. CN1CC(CC(C#N)C(N)=O)CC2c3cccc4[nH]cc(c34)CC21
d. CC(=N)NP(=S)(Oc1ccc(Cl)cc1)Oc1ccc(Cl)cc1
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}