This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Microbiology
The phenomenon of genetic reassortment - 
Select and explain. 
A. Can occur during reovirus replication, B. Involves the crossing over of genes within an RNA segment, C. Can occur during influenza virus replication, D. Can occur only with RNA viruses of plus polarity
A: Can occur during reovirus replication
Answer: A: Can occur during reovirus replication 
Explanation: None