1. Your patient is a 27 year old female who presents with a several month history of progressively worsening fatigue. Lab evaluation reveals a hemoglobin of 9.6, hematocrit of 28.1, and a guiac that is negative. Her further workup reveals a macrocytic anemia. She ensures us that she eats a health diet along with a vitamin supplement, despite having a low Vitamin B12 on lab evaluation. What hormone may she be lacking?
A. Gastrin
B. Intrinsic Factor
C. Cyclooxygenase
D. HCO3
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