What is the specialty of using or not using organs?

Consider following features:

(a) Organ system level of organization

(b) Bilateral symmetry  
 (c) True coelomates with segmentation of body

Select the correct option of animal groups which possess all the above characteristics.

Which of the following glands is called the master gland of the human body?

Which one of the following is NOT linked to the cerebrum?

Carrier of Dengue disease is

Human hormone insulin is produced-

Biological catalyst is___

_____ mirror is used by dentist to see the minute details of the tooth in a magnified form.