This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous, Subject name: Medicine
True about histiocytosis X include the following EXCEPT 
Select and explain. 
A. Seborrheic dermatitis is a known feature, B. Birbeck's granules are characteristic feature, C. Lytic bony lesions are known, D. Associated with angiomyolipoma of kidney
D: Associated with angiomyolipoma of kidney
Answer: D: Associated with angiomyolipoma of kidney 
Explanation: Ans. d (Associated with angiolipoma of kidney). (Ref. Nelson Textbook of Pediatrics 17^/1728; TABLE 499-1)Eosinophilic Granuloma (EG)# EG usually occurs during the first 3 decades and is most common in boys 5-10 yr.# The skull is most commonly/ affected, but any bone may be involved.# Usually present with local pain and swelling. There is often tenderness and warmth in the area of bone.# Spinal lesions may cause pain, stiffness, and occasional neurologic symptoms.# X-ray: Lytic lesions have well-defined or irregular margins {geographic skull) with expansion of the bone.# Spine involvement may cause uniform compression or flattening of the vertebral body (vertebra plana).# No extraskeletal (visceral) involvement distinguishes EG from the other forms of Langerhans cell histiocytosis (Hand- Schiiller-Christian or Letterer-Siwe variants), which have a less favorable prognosis.# Treatment includes curettage and bone grafting, low-dose radiation therapy, or steroid injection.# Observation for symptomatic lesions is fine because most lesions heal spontaneously and do not recur.