In human, teeth are
a)	Homodont and polyphyodont	b)	Heterodont and polyphyodont
c)	Homodont and diphyodont	d)	Heterodont and diphyodont

(d)

In human, teeth are thecodont, heterodont and diphyodont. Thecodont means that teeths are present in bony sockets. When teeth are different in structures and functions, called heterodont,  metatherian and eutherian mammals. When teeth develop during life in two successive sets, this condition is known as diphyodont,  mammals.