Hi Naveen, you are an Indian if you follow any of these:

Citizenship by birth: if you were born in India

Citizenship by descent: if you were born on or after 10th December 1992 outside of India but were born to either parent who is Indian citizen

Then there are Citizanship by registration and  naturalization. If you fall under any of the mentioned categories, then you should opt Indian as your nationality. However if you donot fall under these categories, please do let me know and Ill explain it further. Good Luck!