The underactive endocrine gland which causes goitre is:
(a) pancreas (b) thyroid (c) adrenal (d) pituitary
Distribute the referral code to your friends and ask them to register with Tutorix using this referral code.
Once we get 15 subscriptions with your referral code, we will activate your 1 year subscription absolutely free.
Your subscribed friend will also get 1 month subscription absolutely free.