## Core Concept
Recurrent thoughts of doing something refer to a specific type of psychological phenomenon. This concept falls under the realm of psychiatry and psychology, particularly within the study of mental health disorders and their symptomatology. The term being described here relates to a common symptom seen in various psychiatric conditions.

## Why the Correct Answer is Right
The correct answer, "Obsessions," is right because obsessions are defined as recurrent, persistent thoughts, urges, or images that are intrusive and cause distress. These thoughts or urges are not simply excessive worries about real-life problems but are clearly excessive or unreasonable. The key characteristic of obsessions is that they are recurrent and persistent, significantly interfering with the individual's normal functioning.

## Why Each Wrong Option is Incorrect
**Option A:** Compulsions - Compulsions are repetitive behaviors or mental acts that an individual feels driven to perform in response to an obsession or according to rules that must be applied rigidly. While compulsions are related to obsessions, they are the actions taken in response to obsessive thoughts, not the thoughts themselves.

**Option B:** Phobias - Phobias are intense, irrational fears of specific objects, situations, or activities. They do not typically involve thoughts of doing something but rather avoidance of the feared object or situation.

**Option C:** Anxieties - Anxieties are feelings of worry, nervousness, or unease about something with an uncertain outcome. While anxiety can be a component of obsessive thoughts, the term "anxieties" does not specifically describe recurrent thoughts of doing something.

**Option D:** Delusions - Delusions are fixed, false beliefs that are not amenable to change in light of conflicting evidence. They are more about holding a false belief rather than having recurrent thoughts of performing an action.

## Clinical Pearl / High-Yield Fact
A key point to remember is that obsessions and compulsions often go hand-in-hand, forming Obsessive-Compulsive Disorder (OCD). A classic example of an obsession is a recurrent thought about contamination, leading to a compulsion to excessively wash hands. Recognizing the nature of obsessions and compulsions is crucial for diagnosing and managing OCD.

## Correct Answer: C. Obsessions