Test Differential diagnosis of celiac disease

QUESTION 1: WHAT IS ONE OF THE MOST COMMON GASTROINTESTINAL CONDITIONS THAT CAN BE CONFUSED WITH CELIAC DISEASE?

It is the diagnosis of celiac disease in its latent phase
It is the performance of additional tests to confirm the diagnosis of celiac disease
It is the identification of other factors that may be contributing to celiac disease
Is the identification of other diseases that may be causing the patient's symptoms