Choose correct answer with explaining 
Both hyperplasia and hypertrophy are 
seen in?
a. Involution of Thymus in the adult. 
b. Myositis ossifficant.
c. Right ventricular hypertrophy due to 
pulmonary hypertension.
d. Myometrium of uterus during pregnancy.
The correct answer is c. Right ventricular hypertrophy due to pulmonary hypertension. \n\nBoth hyperplasia and hypertrophy are seen in this condition. \n\nHyperplasia refers to an increase in the number of cells in an organ or tissue. In the case of right ventricular hypertrophy due to pulmonary hypertension, there is an increased workload on the right ventricle due to increased pressure in the lungs. In response to this increased workload, the myocardial cells in the right ventricle undergo both hypertrophy (increase in size of individual cells) and hyperplasia (increase in the number of cells) in order to meet the increased demand for pumping blood against the elevated pulmonary pressure. \n\nInvolution of Thymus in the adult (option a) refers to the natural shrinking or decrease in size of the thymus gland with age, and does not involve hyperplasia or hypertrophy. \n\nMyositis ossificans (option b) refers to a condition where muscle tissue is replaced by bone. This is associated with abnormal bone formation within the muscle tissue, and does not involve hyperplasia or hypertrophy of normal muscle tissue. \n\nThe myometrium of the uterus during pregnancy (option d) undergoes hypertrophy but not hyperplasia. The individual muscle cells of the uterus increase in size (hypertrophy) to accommodate the growing fetus, but there is no increase in the number of cells (hyperplasia) in the myometrium during pregnancy.