Analog Circuits:
- Analog circuits are circuits that process continuous signals.
- The output of an analog circuit is dependent not only on the present input but also on the previous inputs and the internal states of the circuit.
- Therefore, analog circuits do not satisfy the condition of having the output dependent only upon the present input.

Flip Flops:
- Flip flops are sequential circuits that store one bit of information.
- The output of a flip flop is dependent on both the present input and the previous inputs.
- Therefore, flip flops do not satisfy the condition of having the output dependent only upon the present input.

Combinational Circuits:
- Combinational circuits are digital circuits that produce an output based solely on the present input.
- The output of a combinational circuit is a function of the current input values, and there are no internal states that affect the output.
- Therefore, combinational circuits satisfy the condition of having the output dependent only upon the present input.

Sequential Circuits:
- Sequential circuits are digital circuits that have memory elements to store information.
- The output of a sequential circuit is dependent on both the present input and the previous inputs, as well as the internal states of the circuit.
- Therefore, sequential circuits do not satisfy the condition of having the output dependent only upon the present input.

Conclusion:
- Among the given options, only combinational circuits have their output dependent only upon the present input.
- Analog circuits, flip flops, and sequential circuits have outputs that are dependent on the present input as well as the previous inputs and/or internal states of the circuit.