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, or d without using any additional words.
Options:
a) Cn1cnc([N+](=O)[O-])c1Sc1[nH]cnc2ncnc1-2
b) Cc1cc([N+](=O)[O-])ccc1[N+](=O)[O-]
c) CCOC(=O)C(SP(=S)(OC)OC)c1ccccc1
d) CC(C)=NNC(=O)CSc1cc(Oc2ccc(Cl)cc2)ncn1
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}