"reason the topic" is correct and usable in written English.
You can use it when you want to introduce an idea or concept that explains or supports another idea or concept. For example, "The scientific evidence is a strong reason the topic of climate change should be taken seriously."
But for some reason the topic has exploded during the last decade.
That's the reason the topic has hit number one on Yahoo's search list.
For this reason, the topic of low fertility dominated fertility research in advanced societies.
For that reason the topic 'clinical trials' is not included in the catalogue of different categories (Table 1).
One reason the topic has remained largely unexamined is that most studies of pain prevalence in the elderly are cross sectional and provide no information about the progression of pain with time [ 7, 10].
So it stands to reason that the topic of how we argue is one that is surfacing in more and more conversations between moms who seem to want to know how to do it right.
Like others of his ilk that I have encountered over the years, the claimant, a church organist, is a courteous, highly intelligent, learned and apparently rational man who is nevertheless impervious to reason on the topic that obsesses him and to which he has misguidedly devoted years of intellectual effort.
For some reason, when the topic of lad etymology comes about, there is always a Scottish dude sat in the corner even if he wasn't there before, but there's a clap of thunder and somehow he's present, in a LADS ON TOUR ZANTE '08 vest, going, "Ach, we've been calling boys 'laddie' for longer than anyone in England has had pubes".
In the first section we bring to the fore other reasons why the topic of an afterlife is philosophically interesting.
There are two primary reasons why the topic of neighbor discovery became popular: First, if sensors cannot find neighbors within a certain amount of time, they are unattended or useless.
(e.g. Justin Bieber- Beaver) Make sure you put good reasons why the topic sucks.
