The phrase "a topic which is" is correct and usable in written English.
It can be used when introducing or discussing a specific subject or theme in a sentence.
Example: "The research paper focuses on a topic which is crucial for understanding climate change."
Alternatives: "a subject that is" or "an issue which is".
It's a topic which is regularly brought up in relationship counselling sessions.
Assuming that the child is old enough to be submitted to a cross-examination at all - a topic which is to be discussed later - then in fairness to the defendant this must usually be done.
In his statement after protesters breached the walls of the United States Embassy last Tuesday, the spiritual leader of the Egypt's mainstream Islamist group, the Muslim Brotherhood, declared that "the West" had imposed laws against "those who deny or express dissident views on the Holocaust or question the number of Jews killed by Hitler, a topic which is purely historical, not a sacred doctrine".
This is a topic which is left for further studies.
The interfaces studied are brick mortar brick and brick mortar concrete, the latter of which represents the support of facades on concrete slabs, a topic which is not widely dealt with in current research or standards.
This paper introduces a topic which is of growing interest in the traffic control and management community, namely the relation between traffic data quality and the efficiency of traffic management.
But asked about Bishop's less-than-convincing answers about a topic which was, to be fair, outside of her portfolio, Turnbull said superannuation was a "notoriously complex" topic: But I'd say this to you — it's not very complex to know whether you own a $2.3m negatively geared house, most people can work that out".
Each video was based on a topic which was part of the semester's syllabus, and was given to the students at least 3 days prior to the scheduled class period.
He then considered a topic which was compatible with either theory, the lack of coral reefs around the Galápagos Islands.
Arjun, in a fit of rage, accuses Imraan of having an affair, four years back, with Arjun's previous girlfriend (a topic which was very sensitive both to Arjun and Imraan).
Specifically, Bethe argued that Oppenheimer's stances against developing the hydrogen bomb in the late 1940s had not hindered its actual development, a topic which was seen as a key motivating factor behind the hearing.
