This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Acquired Cataract, Subject name: Ophthalmology
How is posterior chamber examined in mature cataract? 
Select and explain. 
A. Laser interferometry, B. Optical coherence tomography, C. B Scan, D. A scan
C: B Scan
Answer: C: B Scan 
Explanation: Ans. (c) B ScanRef: Kanski 7/e, chapter 9, Textbook of ophthalmology by H. V. nema, p 525