The disease caused by the deficiency of iodine is:

Choose the incorrect statement.

Swollen face,mental dullness,dry skin,and loss of appetite are the characteristics of:

The highest concentration of iodine is found in the .....

The hormone responsible for metamorphosis in a tadpole is:

Read the given statements $:$
$(A)$ Hypothyroidism during pregnancy causes defective development and maturation of the growing baby.
$(B)$ Thyroxine does not require a secondary messenger.
$(C)$ Thyroxine plays a major role in the regulation of Basal Metabolic Rate $(BMR)$.
$(D)$ Hypersecretion of thyroxine could cause immunodeficiency.
How many of the above statements are correct?