This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General pathology, Subject name: Pathology
Turner no of chromosomes 
Select and explain. 
A. 45, B. 47, C. 46, D. 42
A: 45
Answer: A: 45 
Explanation: Turner syndrome, characterized by primary hypogonadism in phenotypic females, results from paial or complete monosomy of the sho arm of the X chromosome. With routine cytogenetic methods, the entire X chromosome is found to be missing in 57% of patients, resulting in a 45,X karyotype Clinical features Low posterior hairline Sho stature Coarctation of aoa Cubitus valgus Streak ovaries, infeility, amenorrhea Peripheral lymphedema at bih Webbing of neck Broad chest and widely spaced nipples Pigmented nevi (Robbins Basic Pathology, 9 th edition. page : 240)