Indian Culture:22-Languages

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1.
Which of the following is considered the oldest language in the history of India?
2.
Which among the following is first Classical Language?
3.
Ashtadhyayi, Mahabhasya & Nirkuta are related to which of the following? 
4.
Which among the following is NOT a classical language?
5.
Sylheti language is a dialect of which of the following languages ?