This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pathology
Test tube-shaped rete pegs is a feature of: 
Select and explain. 
A. Psoriasis., B. Reiter's syndrome., C. Geographic tongue., D. OSMF.
A: Psoriasis.
Answer: A: Psoriasis. 
Explanation: Monro abscess seen in:

Psoriasis, geographic tongue

  ↓
Elongation of rete ridges

Reiter’s syndrome

  ↓
No elongation
In Psoriasis → ‘Test tube’ shaped rete ridges