Psychiatry A 17-year-old boy is diagnosed with schizophrenia. What is the risk that one of his siblings will develop the disease? A 2% B 5% C 9% D 20% 💡 Explanation A 17-year-old boy is diagnosed with schizophrenia. What is the risk that one of his siblings will develop the disease? ✓ Correct Answer: C. 9%