Final answer:
A patient's medical history includes demographics, past medical conditions, and family medical history so, all of the above are components of a patient's medical history.
Step-by-step explanation:
The components of a patient's medical history include demographics, past medical conditions, and family medical history. Therefore, the correct answer to which of the following is a component of the patient's medical history is 4) All of the above. Demographics provide details like age, sex, and ethnicity, which can be relevant to health risks and conditions. Past medical conditions can offer insight into recurring issues or potential complications, and family medical history helps to identify genetic predispositions to certain diseases or health conditions. All of these elements are crucial for constructing a comprehensive medical profile for the patient.