This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Genetic Approach to Pediatric Medicine, Subject name: Pediatrics
Kleinfilter syndrome is dignosed by - 
Select and explain. 
A. Karvo typing, B. USG abdomen, C. Triple test, D. Echocadiography
A: Karvo typing
Answer: A: Karvo typing 
Explanation: Ans. is 'a' i.e., Karyo typing Klinefelter syndromeo Extra x chromosome (47 XXY) karyotypeo Small testes with hyalinised seminiferous tubuleso Delayed puberty# Delayed secondory sexual charactero Small peniso Tall & under weighto Mental retardationo Gynaecomastia