This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: miscellaneous, Subject name: Pathology
The gene responsible for folic acid transpo is situated on which chromosome- 
Select and explain. 
A. 10, B. 5, C. X, D. 21
D: 21
Answer: D: 21 
Explanation: Folate transpoer 1 is a protein which in humans is encoded by the SLC19A1 gene. pteroylglutamic acid) into, out of or within a cell, or between cells, by means of some agent such as a transpoer or pore. Folic acid is widely distributed as a member of the vitamin B complex and is essential for the synthesis of purine and pyrimidines.