You have been called to the house of a young adult male patient who is unresponsive. The man lives by himself, so no family is present. In trying to determine the origin of the patient's altered mental status, which of these would most likely provide the best information, assuming it is available to you?

A) Contact with medical direction
B) Examination of patient medications (prescribed and recreational)
C) Interpretation of physical assessment findings
D) Observation of the living conditions in the house

B) Examination of patient medications (prescribed and recreational)