I have installed Windows Boot Camp partition and installed Windows 8. Later, I upgraded to Windows 10.
I am unable to remove Windows partition using bootcamp assistant. The removing Windows option is greyed out.
diskutil list
/dev/disk0
#: TYPE NAME SIZE IDENTIFIER
0: GUID_partition_scheme *121.3 GB disk0
1: EFI 209.7 MB disk0s1
2: Apple_HFS Macintosh HD 70.0 GB disk0s2
3: Apple_Boot Recovery HD 650.0 MB disk0s3
4: Microsoft Basic Data BOOTCAMP 50.0 GB disk0s4
5: DE94BBA4-06D1-4D40-A16A-BFD50179D6AC 471.9 MB disk0s5