In this task, you are given a question and a context passage. You have to answer the question based on the given passage.

Input: Consider Input: What is one example of hydrogen cations?, Context: To avoid the implication of the naked "solvated proton" in solution, acidic aqueous solutions are sometimes considered to contain a less unlikely fictitious species, termed the "hydronium ion" (H3O+). However, even in this case, such solvated hydrogen cations are more realistically conceived as being organized into clusters that form species closer to H9O+4. Other oxonium ions are found when water is in acidic solution with other solvents.

Output: hydronium ion


Input: Consider Input: Which has the lower bit rate, files that meet the ISO Standard or non-standard files?, Context: Non-standard bit rates up to 640 kbit/s can be achieved with the LAME encoder and the freeformat option, although few MP3 players can play those files. According to the ISO standard, decoders are only required to be able to decode streams up to 320 kbit/s.

Output: ISO standard


Input: Consider Input: What has increased in the Someset area since the early 80's?, Context: Population growth is higher than the national average, with a 6.4% increase, in the Somerset County Council area, since 1991, and a 17% increase since 1981. The population density is 1.4 persons per hectare, which can be compared to 2.07 persons per hectare for the South West region. Within the county, population density ranges 0.5 in West Somerset to 2.2 persons per hectare in Taunton Deane. The percentage of the population who are economically active is higher than the regional and national average, and the unemployment rate is lower than the regional and national average.


Output: Population growth