Problem statement: Answer the multiple-choice question.
Query: Which drug has a 18.491\% hERG inhibition at a concentration of 1uM?
Constraint: You must select none, one or more options from a or b without using any additional words.
Options:
[a] O=[N+]([O-])c1cc(Cl)c(Cl)c(Cl)c1Cl
[b] CCN(CC)CCCN1C(=O)c2oc3ccccc3c(=O)c2C1c1cccnc1
Answer: a. O=[N+]([O-])c1cc(Cl)c(Cl)c(Cl)c1Cl
{#Task|Problem statement!}: Answer the {#multiple choice|multiple-choice|MCQ!} question.
{#Question|Query!}: Which {#compound|drug!} {#has|exhibits!} a {herg_central_at_1uM#}{herg_central_at_1uM__units} {herg_central_at_1uM__names__noun}?
Constraint: You must select none, one or more options from {%multiple_choice_enum%2-5%aA1} without using any {#other|additional!} words.
Options:
{SMILES%herg_central_at_1uM%}
Answer: {%multiple_choice_result}. {SMILES#}
1,2,3,4-tetrachloro-5-nitrobenzene