A 23 year old engineering student is brought by his family to the hospital with history of gradual onset of suspiciousness, muttering and smiling without clear reason, decrease socialization, violent outbursts, and lack of interest in studies for 4 months. Mental status examination revealed a blunt affect, thought broadcast, a relatively preserved cognition, impaired judgment and insight. He is most likely to be suffering from -

• A. Anxiety disorder
• B. Schizophrenia
• C. Delusion disorder
• D. Depression