Disease due to deficiency of B Complex vitamins is
Pellagra Niacin deficiency (B complex)Night blindnessVitamin A deficiencyOsteomalacia Vitamin D deficiencySpinocerebellar ataxiaVitamin E deficiency(ref:Harrison's 17/e p442)
Pellagra
Night blindness
Osteomalacia
Spinocerebellar ataxia
All India exam