Which of the following substance requires castle's intrinsic factor secreted by the stomach for absorption in the small intestine?

Q. Intrinsic factor that helps in the absorption of vitamin $B_{12}$ is secreted by:

Q. Castle's intrinsic factor is connected with internal absorption of

Q. Absorption of vitamin $B_{12}$ in human requires "P" glycoprotein secreted from "Q". The correct choice of P and Q are

Q. Vitamin $B_{12}$ is an important vitamin required for normal human body functions. Is is produced only by a commensal bacteria present in our intestine and our body absorbs vitamin $B_{12}$ through a glycoprotein called "Intrinsic factor". A disease called the "Blind Loop Syndrome" (BLS) occurs due to over proliferation of this bacterial flora affecting the normal process of digestion and absorption and also leads to vitamin $B_{12}$ deficiency. The appropriate treatment regime for BLS would involve