What are the three types of hospitals based on income?

The four classification of hospitals based on the sources of income
=> Specialty hospitals – May refer to hospitals that holds rehabilitations or long term treatment for those patients who need extra guidance and care
=> Acute care hospitals -  This refers to a community hospital with nurses and doctors that provide surgery and give treatment and care to patients.
=> Tertiary hospitals – Refer to hospitals that provide specialized consultation and care offered by specialist.
=> teaching hospitals – refers to hospitals that provides training to those students who’s taking up medicine. 

Bmust be the answer, as technically all organs move, so a is incorrect. all organs are made of different types of cells, so that isn’t a problem, so c is also incorrect. human hearts are very similar to many other animals’ hearts, so d is also incorrect, yet the heart is made of muscle, which is hard to grow in the lab so it would be correct to say b