Which of the following statements regarding β-Human chorionic Gonadotropin are NOT correct?
1. It is a glycoprotein hormone.
2. Serum levels increase in pregnancy, germ cells tumor and gestational trophoblastic disease
3. Its levels are same in single and multiple pregnancy
4. It has common and Alpha-sub unit with other hormones FSH, LH and TSH.
Select the correct answer using the codes given below:
(a) 1, 2 and 4
(b) 1, 2 and 3
(c) 2, 3 and 4
(d) 1, 3 and 4