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Which of the following statements is false

A

Hypoxia in tumours can result from two different mechanisms: chronic hypoxia and acute hypoxia

B

Acute hypoxia is caused by a temporary closing of a blood vessel in the tumour

C

Chronic hypoxia is caused by the limited diffusion distance of oxygen through tissue that is respiring

D

Oxygen does not affect the radiosensitivity of tumours

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