young adult patient suffers from long standing pain in the wrist joint and on x-ray examination there was increased density of the lunate bone the diagnosis is.. kein bock's dis

young adult patient suffers from long standing pain in the wrist joint and on x-ray examination there was increased density of the lunate bone the diagnosis is?
a. kein bock's dis.
b. kohler dis.
c. frieberg dis
d. sever's dis
(a)