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: Social & Preventive Medicine
Commonest carcinoma in men in tropical countries- 
Select and explain. 
A. Ca rectum, B. Ca oral cavity, C. Ca testis, D. Ca bladder
B: Ca oral cavity
Answer: B: Ca oral cavity 
Explanation: Most common cancer in males in India → Oro-pharyngeal Ca (Aero-digestive Ca).
Most common cancer in males in world → Lung Ca.
Most common cancer in females in India → Cervical cancer.
Most common cancer in females in world → Brast Ca.
Most common overall cancer in the world (combined male & female) → Lung cancer.
Most common cancer related death in males in India & in world → Ca lung.
Most common cancer related death in females in India & in world → Breast cancer.