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. CC(C)CC(C)OC(=O)C=CC(=O)OC(C)CC(C)C
b. CCCCNC(=O)n1c(NC(=O)OC)nc2ccccc21
c. COP(=S)(OC)SCc1nnc(C(C)C)o1
d. CC(O)COC(=O)CBr
Answer: b
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}