A.Complmentary genes - Two genes present on separate loci that interact together to produce a dominant phenotype is called Complementary gene.
B.Pseudogenes – Genomic DNA sequences similar to normal genes but non-functional; they are regarded as defunct relatives of functional genes.
C.Pleiotrophic genes - The ability of a gene to have a multiple phenotypic effects is known as pleiotrophy and the gene is called Pleiotropic gene and the inheritance is called Pleiotropic inheritance. Eg:Sickle cell anaemia.
D.Cistrons – Functional parts of the DNA is called Cistron.
So, the correct option is ‘Pleiotropic genes’.