Choose the odd one out from the following set, giving the reason for your choice

(i) AIDS, smallpox, diphtheria, measles

Choose the odd one out give reason for your choice.

Choose the odd one out from the following sets, giving a reason for your choice.
Basophils, neutrophils, monocytes, eosinophils.

Choose the odd one out from the following set, giving the reason for your choice.
Mitral valve, sino-atrial node, aorta, pulmonary vein.

Select the odd one out. Give reason for your choice:

Encircle the odd one out. Give reasons for your choice.