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. CCCN(CCC)c1c([N+](=O)[O-])cc(C(C)=O)cc1[N+](=O)[O-]
b. C#CCOc1cccc(OC(=O)NC)c1
c. CNC(=O)N(C)c1nnc(C(C)(C)C)s1
d. COP(=O)(OC)OC(C)=CC(=O)Oc1ccc(C)cc1
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}