This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Growth, Development, and Behavior, Subject name: Pediatrics
[{'content': 'In all the following conditions bone age will be decreased except: \nSelect and explain. \nA. Congenital hypothyroidism, B. Constitutional delay, C. Familial short stature, D. Rickets', 'role': 'user'}, {'content': 'Answer: C \nExplanation: 2Ans: c (Familial short stature) Ref: OP Ghai, 6th ed, p. 50In familial short stature, bone age is equal to chronological age.Familial short stature* Short parents* Short child* Bone age normal i.e.,= chronological age* Ht < expected for age i.e., height age is reduced* Ht age < chronological age =bone ageCongenital hypothyroidism* Delayed bone age* Epiphyseal dysgenesis* Skull -large fontanelle / wide sutures and wormian boneConstitutional short stature* Normal weight and length at birth* Normal growth in first year, then decelerates to < 3rd centile* From about 3 years--growth velocity normal* Bone age < chronological age* Bone age = height age* Puberty delayed* History of short stature and delayed puberty in parents.* Eventual height and sexual development normal in both patients and parents.Short stature--causesProportionateDisproportionate* Normal variants--familial, constitutionalShort limbs * Achondroplasia* PrenatalIUGRIU infectionsChromosomal--Down syndrome* Rickets* Osteogenesis imperfecta* Hypothyroidism* PostnatalShort trunkNutritionalChronic diseasesEmotional deprivationEndocrine except cretinismHypothyroidismPseudohypoparathyroidism,Cushing syndrome* Mucopolysaccharidosis* Spondylo-epiphyseal dysplasia* Caries spineMost common cause of short stature is constitutional (AI2007)', 'role': 'assistant'}]