text: <unk> , a form of Myotonia congenita, is a muscular genetic disorder characterized by muscle stiffness (cramp) and an inability of the muscle to relax after a voluntary contraction. The affected muscle functions normally after a few repetitions.
option_0: Thomsen disease
option_1: Fox-Fordyce disease
option_2: Kummell disease
option_3: Salla disease
option_4: Pott's disease
option_5: Gunther disease
option_6: Sneddon-Wilkinson disease
option_7: Darier's disease