The Difficulties Involved in Growing a Replacement Organ Include All

Multiple Choice

The difficulties involved in growing a replacement organ include all of the following,EXCEPT

A) scientists have not yet figured out how to make biodegradable scaffolds on which to grow the tissues.
B) organs are made from many different types of stem cells.
C) the larger the organ,the more complex it is.
D) most organs require other associated tissues,such as specialized nerves and muscles.
E) usually a biopsy is required to obtain the stem cells,thus resulting in multiple surgeries.