What is the most probable diagnosis for a 23-year-old mentally alert male with dwarfism characterized by disproportionate shortening of the limbs, a prominent forehead, and a receding upper jaw?

Explanation

Achondroplasia is the most common form of disproportionate dwarfism, marked by shortened arms and legs relative to the torso, a prominent forehead, and a retruded maxilla. Other options like cretinism (hypothyroidism) and pituitary dwarfism typically present with proportionate short stature. Acromegaly involves excessive growth hormone leading to enlarged features rather than dwarfism.