The Nurse in the Outpatient Clinic Has Obtained Health Histories

The nurse in the outpatient clinic has obtained health histories for these new patients.Which patient may need referral for genetic testing?

A) 35-year-old patient whose maternal grandparents died after strokes at ages 90 and 96
B) 18-year-old patient with a positive pregnancy test whose first child has cerebral palsy
C) 34-year-old patient who has a sibling with newly diagnosed polycystic kidney disease
D) 50-year-old patient with a history of cigarette smoking who is complaining of dyspnea