A. Lack of green vegetables in diet
B. Use of milled rice
C. Deficiency of calcium in bones
D. Poor use of citrus fruits

A. Trichomonas
B. Giardia
C. Leishmania
D. Trypanosoma

A. Dengue fever
B. Malaria
C. Sleeping sickness
D. Filariasis

A. Sleeping sickness
B. Loss of sight
C. Loss of hearing
D. Loss of memory 

A. Sound waves
B. Time
C. Color contrast
D. Water waves

A. Copernicus
B. Newton
C. Galileo
D. Kepler

A. Albinism
B. Cirrhosis
C. Rabies
D. Pellagra

A. Thiamine
B. Riboflavin
C. Niacin
D. Retinol

A. Riboflavin
B. Thiamine
C. Ascorbic Acid
D. Niacin

A. Riboflavin
B. Retinol
C. Thiamine
D. Niacin