A. Iron
B. lodine
C. Vitamin
D. Pellagra

A. Edward Jenner
B. John F. Enders
C. Leon Calme
D. Louis Pastear

A. Virus
B. Bacteria
C. Protozoan
D. Fungus

A. 2
B. 3
C. 94
D. 5

A. 3 liters
B. 5 liters
C. 7 liters
D. 10 liters

A. 115
B. 501
C. 179
D. 200

A. After it enters the atmosphere of the earth
B. After it enters the earth’s atmosphere and explodes in mid air as a ball of fire
C. After it enters the earth’s atmosphere and lands on the surface of the earth without exploding in mid-air
D. Before it enters the earth’s atmosphere

A. Emotional stress and anxiety
B. Stomach disorders and acute pain
C. Change in heart rate and blood pressure
D. Loss of hearing and early deafness

A. Mumps
B. Small pox
C. Tuberculosis
D. Typhoid

A. Antibiotics
B. Insulin
C. Penicillin
D. Streptomycin