Question

which is the highest Institution of Panchayati Raj in rural areas

Answer 1

The Panchayati Raj now functions as a system of governance in which gram panchayats are the basic units of local administration. The system has three levels: Gram Panchayat (village level), Mandal Parishad or Block Samiti or Panchayat Samiti (block level), and Zila Parishad (district level).
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Answer 2

I think Zila parishad