The Nurse Is Reviewing Information in the Medical Record of a Patient

The nurse is reviewing information in the medical record of a patient with syndrome of inappropriate antidiuretic hormone secretion (SIADH) . Which of these manifestations should the nurse investigate first when assessing this patient? Laboratory report: Serum sodium 115 mEq/L
History and physical: Patient reports fell from bicycle and struck head 5 days ago
Pulse: 100
Blood pressure: 140/95
Previous 24-hour intake and output: 3,500 mL in, 1,500 mL out

A) The patient is lethargic and difficult to wake.
B) The patient states, "I feel thirsty."
C) The patient states, "I have a headache."
D) The patient's urine is dark amber in color.