In a parliamentary form of government, the concept of "first among equals" refers to the role of the Prime Minister. Option 1, the President, is not the correct answer because in a parliamentary system, the President is usually the ceremonial head of state with limited executive powers. Option 3, the Leader of Opposition, is also not the correct answer as they are the leader of the party that has the second-largest number of seats in the parliament, but they are not considered the "first among equals." Similarly, option 4, the Speaker of the lower house, is responsible for maintaining order in the parliament and ensuring fair debate, but they are not considered the "first among equals" either. Therefore, option 2, the Prime Minister, is the correct answer as they are the leader of the government and the most influential member of the cabinet.