Read the text and determine if the sentence is true (see options at the end):

There are four identified subtypes of Ebola virus. Three of the four have caused disease in humans: Ebola-Zaire, Ebola-Sudan, and Ebola-Ivory Coast. The fourth, Ebola-Reston, has caused disease in non-human primates, but not in humans.

Sentence: Most types of Ebola are harmless to humans
Select from:
 A). Yes;
 B). It's impossible to say;
 C). No;