According to the latest report of the World Health Organization, ____ infectious disease outbreak is increasing rapidly in the world ?

a) Measles
b) Chicken pox
c) Malaria
d) Cholera

WHO suggests that there are major measles outbreaks currently occurring in Angola, Cameroon, Chad, Kazakhstan, Nigeria, Philippines, South Sudan and Thailand. In the WHO European region, there were approximately 90,000 cases reported in the first six months of 2019.