A 48-year-old man, who visited his daughter in London last week

A 48-year-old man, who visited his daughter in London last week, complains of sudden severe pain and swelling in his right leg during his flight back to the USA. He is taken to the hospital and ultrasound is performed. It reveals femoral vein thrombosis.
What is the most likely contributed to this finding? #usmle #medicine
A-Hypertension
B-Immobilization
C-Alcohol abuse
D-Hypothyroidism
E-Daily aspirin
Answer: https://qbankusmle.com/?p=646

Ans B