Dr Cutter Finds That 90 Percent of All People Who

Dr. Cutter finds that 90 percent of all people who need brain surgery have dandruff, while only 10 percent of all people with healthy brains have dandruff. He therefore recommends brain surgery for everyone with dandruff. What error is he making?

A) failure to consider base-rate information
B) confusion of categorization-by-levels with categorization-by-features
C) failure to use heuristics to solve a problem
D) unwillingness to accept a risk