A) Down's syndrome
B) sleeping sickness
C) haemophilia-B
D) hepatitis-B
Correct Answer: C
Solution :
Christmas disease is another name for haemophilia-B characterised by the deficiency of factor IX. Down's syndrome is the disorder results when one chromosome (21st chromosome in human beings) is present in three copies. Trypanosoma, is a protozoan, which causes sleeping sickness (African trypanosomiasis). Hepatitis-B is caused by the Hepatitis Virus' (HBV).
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