Problem: Does "Vieira's death did not trigger widespread violence, but there were signs of turmoil in the country, according to the advocacy group Swisspeace." answer the question "What was NOT triggered by Vieira's death?"

A: yes

Problem: Does "Wordless novels are books which use sequences of captionless images to deliver a narrative." answer the question "Storyboards and what are thought to be comics by some?"

A: yes

Problem: Does "In the case of Rotavirus, which was responsible for around 6% of diarrheal episodes and 20% of diarrheal disease deaths in the children of developing countries, use of a Rotavirus vaccine in trials in 1985 yielded a slight (2-3%) decrease in total diarrheal disease incidence, while reducing overall mortality by 6-10%." answer the question "What was the effect of the Rotavirus vaccine?"

A:
yes