Given a question and a context passage, generate the answer having the word or phrase from the context passage. Here, the answer should be a shortest continous span from the passage.

Context: Billionaire Boy is a children's fiction book published on 28 October 2010 by HarperCollins and written by David Walliams and illustrated by Tony Ross. 
 Question: Who was Billionaire Boy illustrated by?
tony ross

Context: After Atahualpa's execution, Pizarro installed Atahualpa's brother, Tupac Huallpa, as a puppet Inca ruler, but he soon died unexpectedly, leaving Manco Inca Yupanqui in power. He began his rule as an ally of the Spanish and was respected in the southern regions of the empire, but there was still much unrest in the north near Quito where Atahualpa's generals were amassing troops. Atahualpa's death meant that there was no hostage left to deter these northern armies from attacking the invaders. Led by Atahualpa's generals Ruminahui, Zope-Zupahua and Quisquis, the native armies were finally defeated, effectively ending any organized rebellion in the north of the empire.:221-223,226 Archaeological evidence of the rebellion incident exists. The remains of about 70 men, women, and adolescents were found in the path of a planned expressway near Lima in 2007. Forensic evidence suggests that the natives were killed by European weapons, probably during the uprising in 1536. Manco Inca initially had good relations with Francisco Pizarro and several other Spanish conquistadors. However, in 1535 he was left in Cuzco under the control of Pizarro's brothers, Juan and Gonzalo, who so mistreated Manco Inca that he ultimately rebelled. Under the pretense of recovering a statue of pure gold in the nearby Yucay valley, Manco was able to escape Cuzco.:235-237 
 Question: Who did Tupac Huallpa succeed as Inca ruler?
atahualpa

Context: Bokermannohyla is a genus of frogs in the Hylidae family. 
 Question: Is Bokermannohyla a genus or species?

genus