A patient with advanced dementia who is living with family members is unable to provide an accurate medical history. In this situation, what would the EMT's best cours

A) Transport the patient to a hospital where he has been previously treated
B) Have the patient's family sign a release-of-medical-information form
C) Determine medical conditions based on assessment findings
D) Ask family members about the patient's past medical history

D) Ask family members about the patient's past medical history