Generate a question which can yield the answer mentioned in the input. Generated question must be answered by the answer provided in input, without using any extra knowledge.

Context : ``The Next Witness'' is a Nero Wolfe mystery novella by Rex Stout, first published as ``The Last Witness'' in the May 1955 issue of The American Magazine. 
Answer : Nero Wolfe
The The Next Witness has what character?

Context : ISO 3166-2:SS is the entry for South Sudan in ISO 3166-2, part of the ISO 3166 standard published by the International Organization for Standardization (ISO), which defines codes for the names of the principal subdivisions (e.g., provinces or states) of all countries coded in ISO 3166-1. 
Answer : International Organization for Standardization
Who set the standards for ISO 3166-2:SS?

Context : ``Perfect Week'' is the 14th episode of the fifth season of the CBS situation comedy How I Met Your Mother and 102nd episode overall. 
Answer : How I Met Your Mother

Of what series is Perfect Week a part of?