Task: Please answer the multiple choice question.
Question: Which molecule has the highest acute oral toxicity rat LD50?
Constraint: Even if you are not sure, you must pick either a, b, c, or d without using any additional words.
Options:
a: COC(=O)C=C(CC(=O)OC)OP(=O)(OC)OC
b: CCCC(CC(OCC)OCC)OCC
c: CCCCCCCCS(=O)CCCCl
d: O=c1nc[nH]c2c1ccn2C1OC(CO)C(O)C1O
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}