A 6-Year-Old Male Is Brought to His Pediatrician's Office with Chickenpox

Multiple Choice

A 6-year-old male is brought to his pediatrician's office with chickenpox. He has had symptoms for one week, and his mother is concerned about the patient's 8-year-old sister because she had a long, painful chickenpox infection 2 years prior. Of note, the patient was not vaccinated against chickenpox because his parents did not think it was a serious enough virus to warrant the pain of the injection.
-If the patient's mother had previously vaccinated her son against chickenpox,what form of immunity would he have had against the virus?  

A) Active natural immunity
B) Passive natural immunity
C) Active artificial immunity
D) Passive artificial immunity