Discharge means leaving a place or institution where one has been staying or receiving treatment. In this context, the correct answer is option 'A' because when someone is discharged, they are leaving a hospital after receiving medical treatment.

Explanation:
When a patient is admitted to a hospital, they receive medical attention and care from doctors, nurses, and other healthcare professionals. Once the patient's condition improves and they are deemed fit for discharge, they are allowed to leave the hospital. The discharge process involves completing the necessary paperwork and ensuring that the patient is aware of any post-treatment instructions, such as taking medication, attending follow-up appointments, and so on.

Some possible reasons for hospital discharge include:

- The patient has completed their treatment and no longer needs to stay in the hospital.
- The patient's condition has improved to the point where they can continue their treatment at home or in a less restrictive environment, such as a rehabilitation center.
- The patient has requested to leave the hospital against medical advice (AMA), meaning they are leaving the hospital without the doctor's approval or without completing their treatment.

Conclusion:
Hence, the correct answer to the question is option 'A' because discharge usually refers to leaving a hospital after receiving medical treatment.