Question

pollen are small, dry protein particles that are produced by trees, grasses, flowers, and weeds. sometimes, these particles can stimulate the bodys immune system. this response is an example of

a. an organ malfunction.
b. a viral infection.
c. an allergic reaction.
d. a seizure.

Explanation:

花粉（pollen）作为外来物质刺激人体免疫系统，这种反应是过敏反应的典型表现。器官功能障碍、病毒感染、癫痫发作均不符合该描述。

Answer:

C. an allergic reaction