Which of the following statements are correct?
I.Frenlum is the fold by which tongue is attached to the floor of mouth or oral cavity.
II. Lower surface of the tongue has little projection which bears taste buds.
III. Pharynx is the common passage for food and air.
IV. Sphincter of oddi guards and regulates the opening of stomach into duodenum.
V. Colon has three parts as ascending, a transverse and a decreasing part and the latter opens into the rectum