Q. A 14-year-old male adolescent comes to the emergency department because of a sore throat. The patient has no recent sick contacts. Vital signs show blood pressure 110/80, heart rate 85, and temperature 38.5 degrees Celsius. Upon examination, the tonsils appear inflamed with a thin whitish membrane. A complete blood count (CBC) reveals lymphocytosis. Abdominal ultrasound reveals mild splenomegaly. A viral infection is suspected. Which of the following is the receptor that facilitates the above viral infection?