Explain the significance of a calcified circle in the left upper quadrant observed in medical imaging.
Multiple Choice:

a) A calcified circle indicates a normal anatomical structure in the left upper quadrant.
b) The presence of a calcified circle may suggest an abnormality, such as a calcified lymph node or vascular structure.
c) Calcified circles are typical artifacts in medical imaging and have no clinical significance.
d) A calcified circle is characteristic of a benign cyst.