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 additional words.
Options:
a. Oc1cc(Cl)ccc1Oc1ccc(Cl)cc1Cl
b. CNCCC(Oc1ccc(C(F)(F)F)cc1)c1ccccc1
c. O=C=NC1CCC2C3CCC(C3N=C=O)C12
d. CCOP(=S)(CC)Oc1ccc(Cl)cc1Cl
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}