Read the text and determine if the sentence is true:

A massive polio immunization drive is under way in more than 20 nations of West and Central Africa, but in Cote d'Ivoire violence has forced a postponement of the vaccination campaign, the Global Polio Eradication Initiative (GPEI) announced November 18.

Sentence: Polio is under control in the world.
OPT:
(a). yes
(b). no
A:
(b).