This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Genetics, Subject name: Pathology
Preferential expression of gene depending on parent of origin is called as 
Select and explain. 
A. Genomic imprinting, B. Mosaicism, C. Chimerism, D. Cloning
A: Genomic imprinting
Answer: A: Genomic imprinting 
Explanation: Ans. (a) Genomic imprintingRef: Robbin's pathology 9th ed. /172-173Preferential expression of an allele depending on parental origin is genomic imprinting.* Praderwili syndrome: Deletion of paternal chromosome 15* Angelman syndrome:Deletion of maternal chromosome 15* Beckwith weidmann syndrome: have two paternal but no maternal copies of chromosome 11* Albright's hereditary osteodystrophy: mutation in Gs alpha subunit leading to short stature, brachydactyl and PTH resistance only when mutation is inherited from the mother.