Identify a true statement regarding muscle cramps.
A. If experiencing a cramp, one should avoid stretching the muscles involved.
B. In pregnant women, muscle cramps are usually caused by iron deficiency.
C. It is a misconception that tight clothing causes muscle cramps.
D. They are caused by a breakdown in the coordination of opposing muscle groups.
E. Calcium supplements often worsen cramps in pregnant and lactating women.
Answer: D
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