This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Dental
Keratin filaments are joined to each other by 
Select and explain. 
A. Desmosomes, B. Merkel cells, C. Lamellar bodies, D. Filaggrin
D: Filaggrin
Answer: D: Filaggrin 
Explanation: Keratohyaline granules in the granular layer contain Filaggrin molecules that bind keratin filaments to each other.