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
Most common cause of epiphora in newborn: 
Select and explain. 
A. Stenosed lacrimal puntum, B. Non-canalisation of nasolacrimal duct, C. Sinusitis, D. Opthalmia neonatorum
B: Non-canalisation of nasolacrimal duct
Answer: B: Non-canalisation of nasolacrimal duct 
Explanation: Non-canalisation of nasolacrimal duct