Final answer:
The answer to the schoolwork question is 'Obsessions', which are intrusive and nonsensical thoughts that an individual tends to resist or eliminate, commonly associated with OCD.
Step-by-step explanation:
Intrusive and mostly nonsensical thoughts, images, or urges that the individual tries to resist or eliminate are known as Obsessions. These are often seen in conditions such as Obsessive-Compulsive Disorder (OCD), where the individual experiences persistent, unwanted thoughts that are difficult to manage and can cause significant anxiety or distress. Unlike hallucinations, which involve sensory perceptions that are not real, obsessions are unwanted thoughts that repeatedly enter the mind. In comparison, delusions are false beliefs held with strong conviction despite superior evidence, while flashbacks are vivid, often traumatic, recollections of past experiences.