This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Schizophrenia and other psychotic disorders, Subject name: Psychiatry
Differentiating features between neurosis and psychosis, In psychosis 
Select and explain. 
A. Insight is preserved, B. Lack of insight, C. Personality and behavior preserved, D. None
B: Lack of insight
Answer: B: Lack of insight 
Explanation: Psychosis is defined as gross impairment in reality testing Marked disturbance in personality, with impairment in social, interpersonal and occupational functioning Marked impairment in judgement and absent understanding of the current symptoms and behaviour(loss of insight) Presence of the characteristic symptoms like delusions and hallucinations. (Ref: a sho textbook of psychiatry, Niraj Ahuja,7th edition, page no.83)