The lower most unit of the rural local self-government isa.Gram Panchayatb.Nagar Panchayatc.Panchayat Samitid.Zilla Parishad

The lowermost unit of the rural local self-government is a Gram Panchayat.

Here's a step-by-step breakdown:

1. In India, the system of rural local self-government is organized at three levels: village, block, and district.

2. The village level is the lowest and most basic level of this system. The institution at this level is called the Gram Panchayat.

3. The Gram Panchayat is composed of elected members from the village community, including the head of the Panchayat, known as the Sarpanch.

4. The next level up is the block level, which is overseen by the Panchayat Samiti.

5. The highest level of rural local self-government is the district level, which is managed by the Zilla Parishad.

6. The Nagar Panchayat, on the other hand, is a form of urban local self-government.

So, the correct answer to your question is a. Gram Panchayat.