I want to know the answer to the following question:
What has no distinction between the categories  of voiced, voiceless, aspirated and unaspirated?
All the background I'm provided with is that "Some of the Dravidian languages, such as Telugu, Tamil, Malayalam, and Kannada, have a distinction between voiced and voiceless, aspirated and unaspirated only in loanwords from Indo-Aryan languages.". Is that enough to answer the question?