Which situation requires an EMS physician to be present at Medical Control radio/phone?
a. When a paramedic needs to consult with a physician for advanced lifesaving interventions.
b. When a patient's condition is deteriorating rapidly and requires immediate medical decision-making.
c. When a complex medical procedure is being performed in the field and medical oversight is necessary.
d. When there is a disagreement between paramedics and hospital staff regarding the appropriate course of treatment for a patient.