A. Barium sulphate
A.
B. Sodium chloride
B.
C. Strontium phosphate
C.
D. Germanium tetrachloride
D.
Correct Answer: A
সঠিক উত্তর: A
Explanation
ব্যাখ্যা
The patient is made to drink Barium sulphate suspension before he/she undergoes examination of the upper gastrointestinal (GI) tract, specifically the pharynx, the esophagus, stomach, and duodenum. Barium is a highly reactive element and hence is not found in nature as a free element.