Hospitalization care of critically ill patients: After receiving the call from the inpatient department, the nursing staff should immediately notify the doctors concerned to make preparations for rescue. Prepare ambulance, oxygen, aspirator, infusion set and other first-aid equipment and medicines. Place the patient in an intensive care unit or emergency room with a bed ready. Cooperate with the rescue, closely observe the patient's condition changes, actively cooperate with the doctor to rescue, and make nursing records. Asking about medical history: For patients who can't correctly describe their illness and needs (such as language disorder and hearing impairment), unconscious patients, infants and so on, in order to ask about medical history, it is necessary to temporarily keep accompanying personnel. The patient is critically ill, has been in a coma and needs emergency treatment, so the correct answer is A.