Which one among these is related to the deficiency of potassium?

Which one among the following diseases is caused due to deficiency of Vitamin D in humans?

Which of the following disease is related to Coronavirus?

The disease caused due to deficiency of iron is known as–

Which disease among these is spread by a protozoa?

With regard to the transmission of the Human Immunodeficiency Virus, which one of the following statement is not correct?