Explanation:
Exp. A
Tetany is usually caused by a reduction in the blood calcium level, which may be due to underactive parathyroid glands, rickets, or alkalosis.
Anaemia - Anaemia is a condition in which the blood doesn't have enough healthy red blood cells. Iron play important role in R.B.C formation.
Angina pectoris - It is very bad pain in the chest caused by not enough blood going to the heart during exercise.
Gout - A form of arthritis characterised by severe pain, redness and tenderness in joints.