This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Unknown
Hypokalemic paralysis is side effect of 
Select and explain. 
A. Gossypol, B. DMPA, C. Testosterone enanthate, D. Cyproterone acetate
A: Gossypol
Answer: A: Gossypol 
Explanation: Its use as a male contraceptive was discovered in China. Gossypol is a yellow pigment isolated from cottonseed oil. It is administered orally 10 to 20 mg daily for 3 months and thereafter 20 mg twice weekly. The action is directly on the seminiferous tubules inhibiting spermatogenesis without altering FSH and LH levels. The side effects such as weakness, hypokalaemia and permanent sterility in 20% cases limit its use.