​Some cellular and extracellular proteins are enlisted in List I and their typical characteristics are enlisted in List II​

​List I​​	​List II​
​A. Nidogen​​	​I. In human genome, one gene of this protein is present but many different isoforms are there due to alternative splicing​​
​B. Fibronectin​	​II. An intermediate filament protein that is typically expressed in epithelial and mesenchymal cells​
​C. Integrin​	​III. One of the principal structural proteins of basal laminae​
​D. Vimentin​	​IV. Heterodimer of α and β subunit and binds to extracellular matrix proteins​

Which one of the following is the most appropriate match?

Correct option is C

Explanation-

​A. Nidogen → III. One of the principal structural proteins of basal laminae.
Nidogen (also called entactin) is a key component of the basement membrane, playing a role in linking laminin and type IV collagen—important structural elements of basal lamina.

B. Fibronectin → I. In human genome, one gene of this protein is present but many different isoforms are there due to alternative splicing.
Fibronectin is encoded by a single gene but has many isoforms due to alternative splicing.

C. Integrin → IV. Heterodimer of α and β subunit and binds to extracellular matrix proteins.
Integrins are transmembrane receptors made of α and β subunits that connect the ECM to the cytoskeleton.

D. Vimentin → II. An intermediate filament protein that is typically expressed in epithelial and mesenchymal cells.
Vimentin is a type III intermediate filament, widely expressed in mesenchymal cells, and also in some epithelial types under specific conditions.

Final Correct Match :
A – III , B – I , C – IV , D – II 
So, Option c is  correct.