Kconfig

 1choice
 2	prompt "choose A or B"
 3
 4config A
 5	bool "A"
 6
 7config B
 8	bool "B"
 9
10endchoice
11
12choice
13	prompt "choose X or Y"
14	depends on B
15
16config X
17	bool "X"
18
19config Y
20	bool "Y"
21
22endchoice