The correct option is B Chairman
The Mayor or the Chairman is the ‘First Citizen’ of the city, and presides over the meetings of the Corporation. He represents the city at various ceremonies, and welcomes all foreign dignitaries. He has access to all the records of the city, and has vast administrative powers.
Councillors and Aldermen, together elect the ‘Mayor’ or the Chairman of the city. Panchayats act as a way of bringing the people and administration closer, and ensure that the state can look after all its citizens.