An intern described a new client to his university class. He noted that the client showed problems with sustaining attention during classroom instruction and showed tendencies of ADHD. Later, in his description, he surmised that the client's ADHD was a cause for his inattentiveness. In this discussion, the two identified variables (ADHD and inattentiveness) are effects and unable to be separated from one another so that one could be manipulated, to test the effect on the other. This is an example of:.

Circular reasoning

Explanation:

Circular reasoning is also called a circular thinking, Paradoxical thinking, It is a cause and reason. This is a type of reasoning in which proposition has been supported by premises. This reasoning is like a circle that has no start at any end. The information is not being shared. This is like fallacy which is quite often humorous.  

To see the effect of one variable on to another variable in ADHD in research is bring manipulated. This is an example of Circular reasoning.

One evolutionary theory of gender is mate selection. This claims gender role behaviours are related to ensuring the survival of ones genes. It states men have evolved a greater desire to have causal sex in order to produce as many offspring as possible to pass on their genes.