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Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
A 12 year old girl has history of recurrent bulky stolls and abdominal pain since 3 year of age. She has moderate pallor and her weight and height are below the 3`d percentile. Which of the following is the most appropriate investigation to make a specific diagnosis?
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The correct answer is  Answer is A (Small intestinal biopsy): 'Small intestinal mucosal biopsy is essential in the evaluation of a patient with documented steatorrhea or chronic diarrhea (>3 weeks). -- Harrisons Failure to thrive in the background of recurrent bulky stools and abdominal pain suggests a diagnosis of chronic malabsorption. Although all options provided in the question may be used to suppo the diagnosis, the most appropriate investigation to make a specific diagnosis is small intestinal biopsy.