This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pediatrics
What is lethal - 
Select and explain. 
A. OX, B. XX, C. OY, D. XXX
C: OY
Answer: C: OY 
Explanation: Ans. is 'c' i.e.,OYSingle Y chromosome is not compatible with life.XX is normal female genotypeX0 is Turner syndrome genotypeXXX is Triple X syndrome genotype