Identify $X$ from Figure 

745-1477

  • A

    Bone marrow

  • B

    Lymph node

  • C

    Lymph vessel

  • D

    Thymus

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Consider the following statements

$I.$ People should get vaccination to avoid infection

$II.$ Vaccination is available against polio, cholera, typhoid, tuberculosis and many othe disease

$III.$ Eradication of vectors are necessary in diseases like malaria and filariasis

$IV. $ Dengue and chikengunya, both are spread by Culex mosquitoes

Which of the statements given above are correct?