This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Gynaecology & Obstetrics
α and β subunits are not seen in: 
Select and explain. 
A. FSH, B. HCG, C. Prolactin, D. Insulin
C: Prolactin
Answer: C: Prolactin 
Explanation: hCG (Human chorionic gonadotropic hormone) has alpha and beta subunits. Its alpha subunit is similar to that of LH (leutinizing hormone), FSH (Follicular stimulating hormone) and TSH (Thyroid stimulating hormone) whereas beta subunits is specific. We have also studied that insulin hormone has alpha and beta subunits.
Remember
Hormones with alpha and beta subunits:

hCG
FSH
Insulin
LH
TSH