Which of the following is a mis-matched pair?

Which of the following are cerebral reflexes?

(i) A person pulls away his hand on touching a hot object.

(ii) A person spits out immediately when a fly enters his mouth while talking.

(iii) A person walking bare foot lifts his foot at once on stepping on to a nail

(iv) A person's pupil contracts at once in the presence of bright light.

Iodine is necessary for the synthesis of which of the following hormone?

One of the following is an incorrect statement about insulin. This is:

The spinal cord originates from: