Given a context passage, generate a question from the passage such that its answer is shortest continous span from the passage.

Ex Input:
Pancreatic ductal adenocarcinoma (PDAC) is one of the most lethal cancers worldwide. Despite significant progresses in the last decades, the origin of this cancer remains unclear and no efficient therapy exists. PDAC does not arise de novo: three remarkable different types of pancreatic lesions can evolve towards pancreatic cancer. These precursor lesions include: Pancreatic intraepithelial neoplasia (PanIN) that are microscopic lesions of the pancreas, Intraductal Papillary Mucinous Neoplasms (IPMN) and Mucinous Cystic Neoplasms (MCN) that are both macroscopic lesions. However, the cellular origin of these lesions is still a matter of debate. Classically, neoplasm initiation or progression is driven by several genetic and epigenetic alterations. The aim of this review is to assemble the current information on genetic mutations and epigenetic disorders that affect genes during pancreatic carcinogenesis. We will further discuss the interest of the genetic and epigenetic alterations for the diagnosis and prognosis of PDAC. Large genetic alterations (chromosomal deletion/amplification) and single point mutations are well described for carcinogenesis inducers. Mutations classically occur within key regions of the genome. Consequences are various and include activation of mitogenic pathways or silencing of apoptotic processes. Alterations of K-RAS, P16 and DPC4 genes are frequently observed in PDAC samples and have been described to arise gradually during carcinogenesis. DNA methylation is an epigenetic process involved in imprinting and X chromosome inactivation. Alteration of DNA methylation patterns leads to deregulation of gene expression, in the absence of mutation. Both genetic and epigenetic events influence genes and non-coding RNA expression, with dramatic effects on proliferation, survival and invasion. Besides improvement in our fundamental understanding of PDAC development, highlighting the molecular alterations that occur in pancreatic carcinogenesis could provide new clinical tools for early diagnosis of PDAC and the molecular basis for the development of new effective therapies.

Ex Output:
Which is the molecular mechanism underlying K-ras alterations in carcinomas?


Ex Input:
Les Abencerages, ou L'etendard de Grenade (English: The Abencerrages, or The Standard of Granada) is an opera in three acts by Luigi Cherubini with a French libretto by Etienne de Jouy, based on the novel Gonzalve de Cordoue by Jean-Pierre Claris de Florian.

Ex Output:
Which place is Les Abencérages in?


Ex Input:
After Alaungpaya's death, the new Burmese king Naungdawgyi was embroiled in several rebellions, including that of Gen. Minkhaung Nawrahta, and could not resume the war. The war was inconclusive. For all their work, the Burmese gained little of their original objectives. Siam very much remained a thorn to the stability of Burmese peripheral regions. In the following years, Siam continued to provide support to Mon rebels in the south who raised a major rebellion in 1762 as well as those in Lan Na in the north . The only lasting territorial gain the Burmese achieved was the upper Tenasserim coast, on which they previously had only a nominal claim. Although the Siamese troops no longer openly intruded the border, the Mon rebels continued to operate from the Siamese territory. In 1764, the Mon governor of Tavoy, who was made governor by Alaungpaya only four years earlier, revolted until it was put down in November 1764. Likewise, the instabilities in Lan Na resumed soon after the Burmese army left in February 1764, forcing the army to return again later in the year. The inconclusive nature of the war would lead to the next war in 1765.

Ex Output:

Which came first, the death of Alaungpaya, or the rebellion of Gen. Minkhaung Nawrahta?