Preliminary tests identified the source of the outbreak as the highly contagious norovirus, which had struck several guests just before they boarded the cruise Nov. 3 in Rome, Carnival officials said.
Can we infer the following?
the source of the outbreak in rubella

Pick your answer from:
 (a). Yes;
 (b). It's impossible to say;
 (c). No;
The answer is:
(c).