The correct option is B A → (iv), B → (v), C → (ii), D → (iii), E → (i)
Following are the diseases mention in the question-
Tetany : Rapid spasms (wild contractions) in muscle due to low Ca++ in body fluid.
Muscular dystrophy : Progressive degeneration of skeletal muscle mostly due to genetic disorder.
Osteoporosis : Age-related disorder characterised by decreased bone mass and increased chances of fractures. Decreased levels of estrogen is a common cause of osteoporosis.
Myasthenia gravis : Auto immune disorder affecting neuromuscular junction leading to fatigue, weakening and paralysis of skeletal muscle.
Arthritis : Inflammation of joints.
So, the correct answer is option-c.