Explanation:

A microprocessor is an integrated circuit that contains all the functions of a central processing unit (CPU) of a computer. It is commonly referred to as a 'microchip' because it is a very small, integrated circuit chip. While it functions as the 'brain' of the computer, the term 'microchip' is a common and accurate alternative name for the physical component. Option (b) 'macrochip' and (c) 'macroprocessor' are incorrect terms. Option (d) 'calculator' describes a device that performs calculations, but a microprocessor is much more versatile. Option (e) 'software' refers to programs and data, not the physical hardware component. Therefore, 'microchip' is the most appropriate alternative term.