Question

The inability to stop thinking about a particular idea or topic is known as:

• A. Compulsive behaviour
• B. Unpleasant behaviour
• C. Obsessive behaviour
• D. Intrusive behaviour

Hint:

Thoughts that stick are obsessions; acts that repeat are compulsions.

Answer 1

The Correct Option is C

Step 1: Understanding the Concept
In OCD, an obsession is a thought, idea or image that keeps coming into the mind. A compulsion is an act repeated to cut the anxiety the thought causes.

Step 2: Read the question
The question asks for the inability to stop thinking about one idea or topic. This is about thinking, not doing.

Step 3: Check option (1) Compulsive behaviour
Compulsive behaviour means repeated acts, such as washing hands again and again. It is about action, so (1) is wrong.

Step 4: Check option (2) Unpleasant behaviour
This is not a technical term in the OCD classification. So (2) is wrong.

Step 5: Check option (3) Obsessive behaviour
Obsession is the repeated thought that cannot be stopped by the person. This matches the question, so (3) is correct.

Step 6: Check option (4) Intrusive behaviour
Intrusive describes how thoughts enter the mind uninvited, but the standard name for the condition is obsession. So (4) is wrong.

Final Answer:
The inability to stop thinking about an idea is obsessive behaviour, option (3). \[ \boxed{\text{Option (3)}} \]