Task: Answer the MCQ question.
Question: Which drug exhibits a 4.662\% 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: CN1c2ccccc2Oc2nnc(Cl)cc21
b: Cc1ccc(OCCCCn2ccnc2)c(Cl)c1
c: O=C(O)COc1ccc2nsnc2c1Cl
d: Clc1ccc2nc(N3CCCCC3)sc2c1
Answer: a. CN1c2ccccc2Oc2nnc(Cl)cc21
{#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#}
CN1c2ccccc2Oc2nnc(Cl)cc21
CN1c2ccccc2Oc2nnc(Cl)cc21
[C][N][C][=C][C][=C][C][=C][Ring1][=Branch1][O][C][=N][N][=C][Branch1][C][Cl][C][=C][Ring1][#Branch1][Ring1][#C]
3-chloro-5-methylpyridazino[3,4-b][1,4]benzoxazine