This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Inflammations of Conjunctiva - Infective, Subject name: Ophthalmology
Herbert pits are seen in trachoma at: 
Select and explain. 
A. Limbus, B. Lid margin, C. Palpebral conjunctiva, D. Bulbar conjunctiva
A: Limbus
Answer: A: Limbus 
Explanation: Ans. (a) LimbusRef: A.K. Khurana 6th ed. 169-70, Parson's 21st ed./173* Herbert pits are oval or circular scar which is left after healing of Herbert pit in the limbus area.Other Signs of Trachoma:* Conjunctival scarring (Arlts line)* Sago grain follicles/Bulbar follicles (pathognomonic)