<prompt> Which of the following shows lowest frequency of cleftlip and palate?NegroesAfghaneseAmerican IndianIndian  <response>: The incidence of cleft lip and palate is 1:600 live births and of isolated cleft palate is 1:1000 live births. The incidence increases in Oriental groups 1:500 and decreases in the black population 1:2000. The highest incidence reported for cleft lip and palate occurs in the Indian tribes of Montana, USA 1:276.Although cleft lip and palate is an extremely diverse and variable congenital abnormality, several distinct subgroups exist, namely cleft lip withwithout cleft palate CLP, cleft palate CP alone and submucous cleft palate SMCP.The typical distribution of cleft types is:Cleft lip alone: 15;Cleft lip and palate: 45;Isolated cleft palate: 40.Cleft lippalate predominates in males, whereas cleft palate alone appears to be more common in females. In unilateral cleft lip the deformity affects the left side in 60 of cases.Key Concept:The incidence increases in Oriental groups 1:500 and decreases in the black population 1:2000. The highest incidence reported for cleft lip and palate occurs in the Indian tribes of Montana, USA 1:276.Reference: Bailey Loves short practice of surgery , 27th ed page no 688 