Task: Answer the multiple-choice question.
Query: Which drug exhibits a 8.898\% human ether-à-go-go related gene (hERG) inhibition at a concentration of 1uM?
Constraint: You must select none, one or more options from a, b, c, or d without using any other words.
Options:
(a) O=c1cc(-c2ccncc2)oc2c1ccc1ccccc12
(b) CCOc1ccc(C(=O)NCCc2ccc3c(c2)OCCO3)cc1
(c) O=[N+]([O-])c1cc(Cl)cc2c1nc(NCCO)c1ccccc12
(d) COc1cc(/C=N/O)ccc1Oc1ccc([N+](=O)[O-])cc1[N+](=O)[O-]
Answer: a. O=c1cc(-c2ccncc2)oc2c1ccc1ccccc12
{#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#}
O=c1cc(-c2ccncc2)oc2c1ccc1ccccc12
O=c1cc(-c2ccncc2)oc2c1ccc1ccccc12
2-pyridin-4-ylbenzo[h]chromen-4-one