Detailed Instructions: In this task, you're given a question, along with a context passage which has extra information available on certain terms mentioned in it, i.e., the proper nouns in the passage. Your job is to determine whether information from more than one term is needed to answer the question. Indicate your choice as 'a' for Yes or 'b' for No.
Problem:Question: What type of joint is between the premaxillae and prefrontals? Passage:The two premaxillae are very long and run up over the snout to meet the prefrontals at the orbit. At the anterior tip they are narrow and triangular in cross-section. They form the classic rhynchosaurian beak, and there is evidence on the fossil showing that it was probably covered by a keratinous sheath. The maxilla carries a massive tooth plate and has numerous foramina for nerves and blood vessels to reach the gums through. Many of the posterior and lateral teeth are unworn from use, unlike the more anterior teeth which have been worn smooth. The nasal bones are large, but no wider than the frontals. They form a pointed posterior tip with a strong zigzag suture. The lacrimal ducts are clearly visible next to the orbit, while the lacrimal bones form much of the interior surface of the orbit. The prefrontal forms a thick eyebrow ridge, possibly as protection from predators. The jugal is complex, with four branches, and forms the anterior and ventral margins of the lower temporal fenestra. The dorsal branch forms a strong pillar behind the orbit, which has a more pronounced crest than other rhynchosaurs. The frontals are very long, and form a dish shape posteriorly. The postfrontal is triangular and forms part of the back of the orbit. The parietals are fused and have a high narrow ridge dorsally, with lateral wings extending across the upper temporal fenestrae. The postorbitals are roughly T-shaped, with three branches. Unlike Late Triassic forms, Fodonyx has a supratemporal bone. The quadratojugal and quadrate are mainly missing. One squamosal is preserved, forming much of the posterior margin of the skull. Much of the palate is intact, although the vomeronasals are quite degraded due to their length and thinness. The palatines form most of the borders of the choana. The pterygoids are very large and have three main processes, all broad and flat. The ectopterygoids are very small and hidden in palatal view. Small fragments of the hyoids are preserved, with a circular cross section and lateral striations. The basioccipital is short and attached to the narrow basisphenoid. The occipital condyle is hemispherical. Much of the detail on the paraoccipital is hard to make out due to difficulties of preparation. Only the anterior portions of the lower jaw are well preserved, but it has the typical rhynchosaur shape, curving up to the anterior tip. Teeth are mainly obscured as the jaws are tightly shut. The splenial is narrow except at the tip where it supports the symphyseal plate.

Solution:
a