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. CCSC(C)CC1CC(=O)C(C(=O)CC)C(=O)C1
b. CCCC1OCC(CC)([N+](=O)[O-])CO1
c. COP(C)(=O)OC
d. CCOc1cc2c(cc1OCC)C1CC(=O)C(CCC#N)CN1CC2
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}