Find the best solutions to your problems with the help of IDNLearn.com. Whether it's a simple query or a complex problem, our community has the answers you need.

What characterizes mixed connective tissue disease (MCTD)?
A) The presence of symptoms from multiple connective tissue diseases, such as lupus, scleroderma, and polymyositis, in the same patient
B) A condition where connective tissue becomes more rigid and less flexible
C) A disorder involving only the muscles and bones, with no impact on connective tissues
D) A type of cancer that affects connective tissue cells