An 18 year old male had a severe dislike for touching door knobs. He feared contamination and spent hours washing his hands if he had to open a door at his office. He spent more than 3-4 hours taking a shower and spent a lot of time cleaning surfaces after "incidental contaminations". Eventually, he stopped waking up in the morning as it was not worth the effort. Identify the disorder, he is suffering from:

Obsessive-Compulsive and Related disorders.

The correct answer is Option (1) → Obsessive-Compulsive and Related disorders.

The individual exhibits symptoms consistent with Obsessive-Compulsive Disorder (OCD), which is characterized by intrusive thoughts (obsessions) and repetitive behaviors or mental acts (compulsions) performed to reduce anxiety related to those thoughts. In this case, the fear of contamination leads to excessive hand washing and cleaning behaviors. The description also indicates significant impairment in daily functioning, which is a hallmark of OCD.