What is the fine-grained topic of the following text: Furthermore a clarification on the GO made it clear that free parking can be availed if the customer provides a proof of purchase at the establishment in the case of hospitals, by providing hospital bills or Out Patient Department receipts, but activists allege that hospitals charge anywhere between Rs 20 and Rs 50, with additional charges on an hourly basis, for those visiting the hospitals. Only return the topic.
Free parking policy in hospitals with proof of purchase