Which organ cannot be transplanted in human body?

The function of Hemoglobin in the human body is to- 

All of the following diseases are caused by a virus, except

Which of the following diseases is caused by bacteria?

Which of the following is the smallest organism?

Is the center of intelligence and cleverness in the human brain?

Antibodies that participate in the defense mechanisms of our body are __________. 

Endospermic seeds are found in ________.