This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Genetics And Genetic Disorders, Subject name: Pediatrics
Absence of clavicle is a feature of: 
Select and explain. 
A. Cleidocranial dysplasia, B. Multiple epiphyseal dysplasia, C. Fibrous dysplasia, D. Cranio-Metaphyseal dysplasia
A: Cleidocranial dysplasia
Answer: A: Cleidocranial dysplasia 
Explanation: a. Cleidocranial dysplasia(Ref: Nelson's 20/e p 618-619)Cleidocranial dysostosis, also called cleidocranial dysplasia or mutational dysostosis, is a hereditary congenital disorder, where there is delayed ossification of midline structures; Absent clavicles and delayed dentition.