Beri-beri is
a) Disease caused by a deficiency of thiamine, endemic in eastern and southern Asia, and characterized by neurological symptoms, cardiovascular abnormalities, and edema. It is also called endemic neuritis
b) Inflammation at the corners of the mouth caused by a deficiency of riboflavin, associated with a wrinkled or fissured epithelium that does not involve the mucosa
c) A disorder of the lips often due to riboflavin deficiency and other B-complex vitamin deficiencies and characterized by fissures, especially in the corners of the mouth
d) All of the above
