Dr. Leung's research in gerontology is focused on plasticity. He works with people who have experienced some decline in cognitive ability and measures how well they can learn and apply new adaptive methods. Which core issue of human development does Dr. Leung's research explore?

Of the few psychotherapists who treated schizophrenic patients before the discovery of antipsychotic drugs, most believed that the first task of therapy was to:

A. win the trust of patients and build a close relationship with them. B. get the patient to openly admit that their hallucinations were not real. C. challenge the delusions that so many patients held, so that they could treat the "real" person and not just the symptom. D. make the family members understand that schizophrenia had no real cure, and that only a modicum of improvement could or should be expected.

People with gender identity disorder:

a. are homosexual. b. can have any sexual orientation. c. are asexual d. are bisexual.