The correct option is D Chondrocytes - Smooth muscle cells
Chondrocytes are cells of cartilage enclosed within a small lacuna in the matrix of cartilage.
Hence, the incorrectly matched pair is 'chondrocytes - smooth muscle cells' (option a).
Neurons or nerve cells are structural and functional units of neural tissue.
Fibroblasts are found in the matrix of areolar connective tissue. These cells produce collagen.
Osteocytes are derived from bone forming cells, the osteoblasts.