system
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
Unilateral elevation of diaphragm is commonly due to – a) Obesityb) Large liverc) Scoliosisd) Congenital causes
assistant
The correct answer is  Scoliosis can cause unilateral elevation of hemidiaphragm.
Obesity and hepatomegaly cause bilateral elevation of hemidiaphragm.

Option 'b' requires specific mention here :-
Hepatomegaly (large liver) causes bilateral elevation of hemidiaphragm because normal liver is under both the dome of diaphragms. Therefore, enlargment of whole liver (hepatomegaly) causes bilateral elevation of hemidiaphragm. However, involvement of a part of liver (e.g. liver abscess) causes unilateral elevation of hemidiaphragm.