CLEAN : Death toll tops 220 in four day assault on Syria rebel enclave

The video introduces Doctor Medina and discusses how he became aware of a particular subject or event.

Who is the main subject of the video?

• Doctor Brown

• Doctor Johnson

• Doctor Medina

• Doctor Smith

What did Doctor Medina become aware of?

• A scientific conference

• An important event

• A groundbreaking research

• A new medical procedure