If a child was allergic to a substance scratched onto their skin, the area turned red and swollen within about 10 minutes. Which of the following would cause these symptoms?

Answer 1

If a child was allergic to a substance scratched onto their skin, the area turned red and swollen within about 10 minutes. Which of the following would cause these symptoms?
Answer
Release of interleukin-10
Recruitment of B cells
Release of histamine
The presence of flatworms
The presence of dust mites

Answer 2

Recruitment of b cells