197. Correct about right and left main bronchi is_______________?

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A. Right bronchus is more vertical and broader than the left
B. Right bronchus is more vertical and has a narrow caliber than the left
C. Left bronchus is more vertical and broader than right
D. Left bronchus is more vertical and narrower than right
✅ The correct answer is option A. Right bronchus is more vertical and broader than the left.

68. Opaque porcelain________________?

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A. Is Feldspathic glass
B. Contains opacifier like zirconium and titanium oxide
C. Not used to mask the colour of the cement used in placing of restoration
D. Used to produce the characteristic translucence, which is an inherent aspect of the incisal edge in natural teeth
✅ The correct answer is option B. Contains opacifier like zirconium and titanium oxide.