Given below are four statements (i-iv) regarding human blood circulatory system
i) Arteries are thick-walled and have narrow lumen as compared to veins
ii) Angina is acute chest pain when the blood circulation to the brain is reduced
iii)Persons with blood group AB can donate blood to any person with any blood group under ABO system
iv)Calcium ions play a very important role in blood clotting

Options

A. (i) and (iv)
B. (i) and (ii)
C. (ii) and (iii)
D. (iii) and (iv)

Answer

A