Task: Please answer the multiple choice question.
Question: Which molecule has the highest LD50 in rats (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. COc1ccc2c(c1)c(CC(=O)NO)c(C)n2C(=O)c1ccc(Cl)cc1
b. CC[Si]1(CC)N[Si](CC)(CC)N[Si](CC)(CC)N1
c. CN(C)CCCN1c2ccccc2CCc2ccc(Cl)cc21
d. Cc1ccccc1-c1nc2c(N)nc(N)nc2nc1N
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}