A Clinic Centre would like to implement a system to maintain the Patient’s Visit Records. The system will keep and update the information related to Registration, Out Patient Department visits, related Doctor Information and Medical history (Patient Wise). All records will be maintained with respect to the Registration Number of Patients. On Registration, each Patient is normally attached with a medical advisor (Role of Doctor) for necessary guidance. One advisor may guide several Patients at any point of time. Draw Class diagram for the above activities.