###Rationale: Ans. B. Interstitial cells of the peritubular capillary bed of the kidneysErythropoietin is a glycoprotein hormone which stimulate erythrocyte production.In adults, about 85% of erythropoietin comes from the kidney (interstitial cells in peritubular capillary bed) and 15% from liver (Perivenous hepatocytes). Small amount is also produced in brain; and uterus and oviduct.

###Answer: OPTION B IS CORRECT.
###Question: Erythropoietin is/are produced by -
###Options:
A. Juxtaglomerular cells
B. Interstitial cells of the peritubular capillary bed of the kidneys
C. Pars recta of PCT
D. Macula densa
