Coordinate Geometry: JEE Main 2018 Mathematics question

Tangent and normal are drawn at P(16, 16) on the parabola y² = 16x, which intersect the axis of the parabola at A and B, respectively. If C is the centre of the circle through the points P, A and B and $\angle$CPB = $\theta$, then a value of tan$\theta$ is :