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
All are true about cartilage, hair hypoplasia syndrome Except - 
Select and explain. 
A. Neutropenia, B. Depigmentd hair, C. Non functioning T cells, D. None of the above
C: Non functioning T cells
Answer: C: Non functioning T cells 
Explanation: Ans. is 'c' Nonfunctioning T cells (Ref. Nelson., 17/e, p 698, 727, 790 (76/e, 625))Cardinal feature of cartilage hair hypoplasia syndrome :*Short limb dwarfism*.*Very fine thin light hairs* and eyebrows.*Hyperextensible joints of hands* and feet but an inability to extend.*Abnormalities of spine.*Neutropenia**Defective antibody mediated immunity.*Severe combined immunodeficiency and combined immunodeficiency*.*Decreased number of T cells and defective T cell proliferation, cell mediated immunity is also decreased.Nothing is written about the function of T cell, only their number is decreased.