Task: Please answer the multiple choice question.
Question: Which molecule has the highest rat LD50 (oral exposure)?
Constraint: Even if you are not sure, you must pick either a, b, c, or d without using any other words.
Options:
a. O=C1C2CC=CCC2C(=O)N1SC(Cl)(Cl)C(Cl)Cl
b. O=C(O)C1CCc2cc(C3CCCCC3)c(O)cc21
c. CCSc1nc(NC(C)C)nc(NC(C)C)n1
d. CCCC1=NN(c2ccccc2)C(=O)C1C=O
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}