<prompt> Multifactorial inheritance is seen inNeurofibromaHaemophiliaCardiac septal defectsHypophosphatemic rickets  <response>: The multifactorial disorders result from the combined actions of environmental influences and two or more mutant genes.Some disorders of multifactorial inheritance are cleft lippalate, congenital hea disease, coronary hea disease, hypeension, gout, diabetes, pyloric stenosis etc.Note: Most of the congenital diseases are multifactorial. In our question cardiac septal defect is the only congenital disease.Ref: Robbins 7e p170 