Patients on dialysis are often restricted in cow's milk due to its high content.
a. phosphorus and potassium
b. vitamin d and calsium
c. protein and iron
d. sodium and vitamin a

A) Phosphorus and potassium

Explanation:

Patients on the dialyses are restricted from the cow milk due ti high phosphorous and potassium content as, it is the low fat milk which basically avoided because it is not good for health during the dialysis. Presence of high amount of phosphorous converting into the dangerous calcium which weaken our bones. Excessive intake of potassium also harmful for the patients.

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answer: collecting information/data

reason: the student is going around and asking people questions to collect data

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