This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: NEET Jan 2020, Subject name: Medicine
A patient of Scleroderma presents with acute respiratory distress. Chest X-ray shows B/L reticular basilar shadows. What is the next line of investigation in this patient? 
Select and explain. 
A. Echocardiography to look for Cor pulmonale, B. High resolution CT, C. Pulmonary function test, D. Contrast enhanced CT scan
B: High resolution CT
Answer: B: High resolution CT 
Explanation: If scleroderma is suspected or has been confirmed, it is impoant to verify whether or not it has spread to the lungs, where it can cause scar tissue formation. HRCT allows better assessmentof the extent and distribution of disease. In the appropriate clinical setting HRCT may be sufficiently characteristic to preclude the need for lung biopsy. Pulmonary function tests are done to measure how well the lungs are functioning. Echocardiogram: This is recommended once every 6 to 12 months to evaluate for complications like pulmonary hypeension and/or congestive hea failure.