Task: Please answer the multiple choice question.
Question: Which molecule has the highest acute oral toxicity (LD50 in rats)?
Constraint: Even if you are uncertain, you must pick either a, b, c, or d without using any additional words.
Options:
(a) O=C(O)CCCc1ccc(N(CCCl)CCCl)cc1
(b) CCCCN(CCCC)S(=O)(=O)c1ccc(Cl)cc1
(c) COCC(=O)N(c1c(C)cccc1C)N1CCOC1=O
(d) N#Cc1c(Cl)c(Cl)c(Cl)c(C#N)c1Cl
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}