This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General, Subject name: Skin
Lovibond profile sign is seen in - 
Select and explain. 
A. Koilonychias, B. Platynochia, C. Clubbing, D. Onycholysis
C: Clubbing
Answer: C: Clubbing 
Explanation: Ans. is 'c' i.e., Clubbing "Clinical indicators of clubbing are Lovibond profile sign and curth s modified profile sign"o Lovibond angle is the angle located at the junction between the nail plate and proximal nail fold. It is normally less than 160deg. In clubbing, the angle exceeds 180deg (Lovibond profile sign).