The correct answer is option 2: Australia. The Hockey Champions Trophy held in Chennai in December, 2005 was won by the Australian team.
To understand why this is the correct answer, let us analyze the other options:
Option 1: Netherlands - This option is incorrect because the Netherlands did not win the tournament. Although the Netherlands is a strong hockey nation and has had success in previous tournaments, they were not the champions in this particular event.
Option 3: Germany - This option is also incorrect. Although Germany has a strong hockey program and has won numerous championships in the past, they did not win the Hockey Champions Trophy in Chennai in 2005.
Option 4: Spain - This option is incorrect as well. Spain is not historically a dominant force in international hockey and did not win the tournament in question.
Based on the analysis of the options, we can conclude that option 2, Australia, is the correct answer. It is essential to ensure accuracy when answering such questions in order to provide correct information to readers.