Read the following paragraph and answer the question.

Sinta is a nurse. She looks after sick people. She usually gets up at 6.00 o’clock. Today she is late, it is 6.30 and she is still in bed. She usually goes to work by train but today she is driving to work. She arrives at work at 6.30 every morning but it is 7.30 now and she is still driving. It’s 12.00 o’clock now. She always has her lunch at 12.00 but today she isn’t having lunch at 12.00, she is looking after her sick patients. 

"... , she is looking after sick people."

The word "looking after" has the closest meaning with ....