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: Ophthalmology
Positive fluorescein dye disappearance test indicates that watering eye is due to: 
Select and explain. 
A. Atonia of the sac, B. Mechanical obstruction in the lacrimal passages, C. Both of the above, D. None of the above
C: Both of the above
Answer: C: Both of the above 
Explanation: Ans. Both of the above