This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Gynaecology & Obstetrics
True hermaphroditism karyotype 
Select and explain. 
A. 45 X0 STREAKED GONADS, B. 46 XX OVO TESTIS, C. 47 XY+9, D. 47 XX
B: 46 XX OVO TESTIS
Answer: B: 46 XX OVO TESTIS 
Explanation: * True hermaphrodite or ovotesticular disorder of sexual differentiation (OVO-DSD) is one of the rarest variety of all inter sex anomalies. * In about 90% of cases, patients have 46 XX karyotype. * Rarely, 46 XY/46 XX mosaicism may occur REF : SHAW TEXT BOOK OF GYNECOLOGY