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. CCOP(=O)(OCC)OC(=CBr)c1ccc(Cl)cc1Cl
b. CC(=O)c1ccc(C(O)C(CO)NC(=O)C(Cl)Cl)cc1
c. CC(Oc1cc(Cl)c(Cl)cc1Cl)C(=O)O
d. CCCCN(CCCC)C(=O)SCc1ccccc1
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}