This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Orthopaedics
[{'content': 'An absolute indication of X-ray of the pelvis in case of congenital dislocation of the hip are all except - \nSelect and explain. \nA. Positive family history, B. Breech presentation, C. Unstable hip, D. Shortening of limb', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Screening for DDH/CDH\n\nThe method of screening and the choice of the population to be screened are controversial. Three methods of DDH screening have been described.\n\n\nClinical screening via universal physical examination during the first year of life by properly trained medical providers. Follow-up ultrasounds for abnormal or questionable examinations can be considered.\nUniversal clinical (physical examination) screening with additional selective ultrasound or radiographic screening for children with risk factors. This risk factors proposed include female gender, breech presentation at delivery, positive family history, and some data suggest torticollis and congenital foot deformity as well. The practitioner must remember that the majority of children with DDH have no identifiable risk factors; thus, this method of screening cannot be expected to detect all cases of DDH. Ultrasound or radiographic examination is an adjunct, not a replacement, of clinical examination.\nUniversal screening of all babies with ultrasound or radiography in addition to a physical examination. This practice would be expensive and would require significant additional resources. The benefit of universal screening has not been demonstrated, and the practice would increase the identification of "abnormalities" that would resolve without intervention.\n\nBecause female infants with a positive family history of DDH and females born in the breech presentation have the highest risk of DDH, imaging with an ultrasound or radiography is recommended for these infants.', 'role': 'assistant'}]