Which of the following substances can cause vasodilation?

Which one of the following is a matching pair of a certain body feature and its value/count in a normal human adult?

Which of the following is a characteristic of pernicious anemia?

Which of the following statements are wrong?
$(i)$ Leucocytes disintegrate in the spleen and liver.
$(ii)$ $RBC$,$WBC$ and blood platelets are produced by bone marrow.
$(iii)$ Neutrophils bring about destruction and detoxification of toxins of protein origin.
$(iv)$ The important function of lymphocytes is to produce antibodies.

In normal humans,the time taken for normal blood clotting is:

Which of the following is an incorrect combination?