doctor jyoti tirumalasetti with stanford health care. thank you so much for your insight today. >> thank you. >> coming up next, your doctor and your health, a study finds you might be better off with a female doctor, especially if you're a health. turns out it can. a new study led by ucla finds women are less likely to die when they're treated by female doctors. joining us live now to explain why is doctor lisa rosenstein a primary care physician and assistant professor at ucsf, who coauthored the study? doctor rosenstein, thank you for your time. >> thank you for having me. >> before we dive into the study, just indulge me for a moment here, and i'm going to pose a puzzle, a brain teaser to our viewers that i think you and i might know, but half to three quarters of americans can't figure out. so here it goes. a father and son get into a car crash and are rushed to the hospital. the father dies. the boy is taken to the operating room and the surgeon says, i can't operate on this boy because he's my son. how is this possible? judging fr