This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Endocrinology, Subject name: Medicine
True about pseudohypoparathyroidism- 
Select and explain. 
A. Heterotopic calcification, B. edCa2+, C. iedP04, D. TedPTH
A: Heterotopic calcification
Answer: A: Heterotopic calcification 
Explanation: most patients have PHP -1a and reveal characteristic features of AHO consisting of sho stature, round face, skeletal anomalies and heterotopic calcification ( Harrison 17 pg 2394)