TypeError: randint() takes exactly 3 arguments (2 given)

import random
List1 = ['I am a ', 'You are a ']
List2 = ['man', 'woman', 'duck']
L1 = random.randint(List1)
L2 = random.randint(List2)
print L1 + L2

I am trying to make a random sentence generator, but instead got an error: TypeError: randint() takes exactly 3 arguments (2 given)