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: ENT
Throat infection causes Ear infection through: 
Select and explain. 
A. Blood spread, B. Eustachian tube, C. Nasocranial spread, D. Simultaneous infection
B: Eustachian tube
Answer: B: Eustachian tube 
Explanation: M/C route of infection in middle ear is Eustachian tube. Infection travels the lumen of the tube or along subepithelial peritubal lymphatics.Eustachian tube is infants and young children is shoer, wider and more horizontal and thus accounts for higher incidence of infections in this age group.