This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Physiology
Which of the following cancer can cause referred otalgia i.e. Referred pain in the Ear? 
Select and explain. 
A. Ca larynx, B. Ca pharynx, C. Ca oral cavity, D. All of the above
B: Ca pharynx
Answer: B: Ca pharynx 
Explanation: Oropharyngeal cancer, most being squamous cell cancer, is one of the most worrisome entities producingpain referred to the ear Ref ganong's review of medical physiology 25e 651