what are the four main subtypes of schizophrenia?
['Paranoid: Where someone feels he is being persecuted or spied on.', 'Disorganized: Where people appear confused and incoherent.', 'Catatonic: Where people can be physically immobile or unable to speak.', 'Undifferentiated schizophrenia: A subtype in which no paranoid, disorganized or catatonic features are prominent .']