A Patient Is Complaining of Abdominal Pain, Nausea, and Vomiting

A patient is complaining of abdominal pain, nausea, and vomiting. Which of the following will provide you with the most immediately useful information?

A) Checking for discoloration of the tongue
B) Asking about any unusual taste in the mouth
C) Asking about the presence of coffee-grounds emesis
D) Finding out about any unusual stress in the patient's life