‘Syphilis' is a sexually transmitted disease caused by

  • A

    Treponema pallidum

  • B

    Leptospira

  • C

    Pasteurella

  • D

    Vibrio

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Cirrhosis is

In the given flow diagram, the replication of retrovirus in a host is shown. Observe and answer the following questions.

$(a)$ Fill in $(A)$ and $(B)$

$(b)$ Why is the virus called retrovirus ?

$(c)$ Can the infected cell survive while viruses are being replicated and released ?

Which of the following is related to humoral immunity?

It provides the sites for interaction of lymphocytes with the antigen which then proliferate to become effective cells

Oral cancer may be caused by