challenge: What is the significance of the middle name 'McLean' in McLean Stevenson's family?
  
  A. It was derived from a famous actor in the family lineage
  B. It came from his father, Edgar, who was a renowned cardiologist
  C. It originated from his paternal grandmother, Lottie McLean
  D. It was passed down from his great-grandfather, William Stevenson
  Answer: 